「Rotation of crotch feces」meaning LIGHT, TRIVIAL, UNIMPORTANT as a possible source of the English expression, 'what's a fart among friends?' to describe movement in the colon that liberates gasses for immediate release: anal queefing.
　「Cart up to its crotch in mud」may have been the result of a CARELESS, THOUGHTLESS mistake, would probably have been emptied and abandoned. A cart will become LIGHTER IN WEIGHT by first unloading, obviously, and would make it easier to pull out of thick soil or muck, suggesting LIGHT-DUTY with no cargo, and NO LOAD to sell, protect, or transport was an UNIMPORTANT cart.
　Perhaps a suggestion to grease the axle prior to use in order to lighten the load,「screwing with axle plugging orifice for a religious experience.」
　Nevertheless,「multiple screwing(s) filling orifices, military use」of「muck in crotch」or「divine services as an experience with an array of very loose flesh seams」as it relates to CARELESS, TRIFLE, UNIMPORTANT, RECKLESS and so on, refers to the military's use of service providers. Note that this is a Chinese glyph, one not created by the Japanese, indicating the use of comfort women well preceded wars of the twentieth century and perhaps the nascence of Japan as a country 2,600 years ago or so, as just another Chinese practice that seemed like a good idea at the time [crushing the bones in the feet of little girls].
　Clearly, the use of such human ports communally was the perfect method for spreading disease and infection, THOUGHTLESS, CARELESS, and RECKLESS, as were the men in their attitudes regarding these women. Napoleon's army suffered approximately a 20% troop loss rate and the U.S. in WWII over 10% at any one time due to what where then called venereal diseases (dis-ease due to the mons Venus, or female pubis bone of infected service providers engaged as a short-term rental).
　Needless to point out is the fact that the women were relatively FEW IN NUMBER compared to the long ranks of soldiers waiting in line. After the first two or three men, orifices became well lubricated with the prior men's ejaculations, resulting in LIGHT DUTY for those troops next in line during the remaining hours of the session that the women were「providing comfort」but not any lighter duty for the woman, naturally. One must wonder what sort of anal queefing with slurry/axle grease spurted from each woman's anus after servicing 200-250 men and her shift was over.
　Military use of comfort women was not a Japanese invention, formerly…everyone did it: pirates, bandits, gangs, armies the world over…because they could. Then there is God Almighty's take on this matter, found in Deuteronomy 21:10 When you go to war…and you take captives, 11 if you notice among the captives a beautiful woman and are attracted to her, you may take her as your wife. 12 Bring her into your home…then you may go to her and be her husband and she shall be your wife. 14 If you are not pleased with her, let her go wherever she wishes. You must not sell her or treat her as a slave, since you have dishonored her. See this researcher's website blog and well-documented published material to learn about the relationship between Japan and Korea prior to WWII, who it was that actually recruited Korean women as army service providers (in nearly all cases), and who is behind why this issue remains a propaganda flashpoint today:
　「I first confronted the comfort women issue in 1991. It was near the end of my study in Japan. As a volunteer I was translating former Korean comfort women's testimonies for NHK. When I returned to South Korea, the nationalism was out of control. The anti-Japanese activist group 'Korean Council for the Women Drafted for Military Sexual Slavery' (also known as Chong Dae Hyup 정대협 挺対協) was formed by the South Korean communists. Its leader said publicly it was determined to defame Japan for the next 200 years. Its propaganda turned me off, so I stayed away from this issue for years. I regained my interest in this issue in the early 2000s when I heard that Chong Dae Hyup was confining surviving women in a nursing home called House of Nanumu. The only time these women were allowed to talk to outsiders was when Chong Dae Hyup needed them to testify for the UN Special Rapporteur or the U.S. politicians. But for some reason I was allowed to talk to them one day in 2003. I could sense that women were not happy being confined in this place. One of the women (Bae Chun-hee) told me she reminisced the romance she had with a Japanese soldier. She said she hated her father who sold her. She also told me that women there didn't appreciate being coached by Chong Dae Hyup to give false testimonies but had to obey Chong Dae Hyup's order. When Japan offered compensation through Asian Women's Fund in 1995, 61 former Korean comfort women defied Chong Dae Hyup's order and accepted compensation. Those 61 women were vilified as traitors. Their names and addresses were published in newspapers as prostitutes, and they had to live the rest of their lives in disgrace. So the rest of the women were terrified of Chong Dae Hyup and wouldn't dare to defy again. Chong Dae Hyup (some of its members were arrested as North Korean spies) has used the comfort women issue for its political purpose, which is to drive a wedge into U.S.-Japan-South Korea security partnership.」
　　[　https://scholarsinenglish.blogspot.jp/2014/10/summary-of-professor-park-yuhas-book.html 2017-08-03　]
　Or, do you believe the North Koreans?　

Modern definitions (that generally disregard history) …excluding politically incorrect concepts and other meanings deemed offensive today; may list only pigeonholed definitions, euphemisms, or meaningless mnemonics)
Chinese: Japanese variant of 輕|轻
Japanese: light, feeling light, nimble, agile, non-serious, minor, unimportant, trivial, slight, small, gentle, soft, easy, simple, indiscriminate, lightness, easily, carelessly, indiscreetly, thoughtlessly, frivolously, scorn, disdain, to belittle, to look down on, to make light of, to despise
Unihan extended: light; easy, simple; gentle
EDRDG: lightly; trifling; unimportant