Level areas were built encircling hills as terraced areas for farming that could be irrigated easily by trapping rainfall. These paddies were often FILLED with muck water as wetlands and also fertilized by carrying fecal slurry up the hill and spreading it over the muck.「Quintessential feces」variant form (填) is defined as「to fuck, to pack it in, stuffing」to mean FILL IT IN, ALL IN, FULL.
Where「genuineness」is located may be quite easily discovered by anyone seeking to find it:
「…[T]he vagina has few nerve endings, and therefore cannot create an orgasm on its own. Instead of thinking of the vagina and clitoris as separate entities, try thinking about them as a network of nerves and muscles.」
「In reality, total separation between the vagina and clitoris is mostly artificial, and often based on a misunderstanding of what, where, and how big the clitoris really is. The clitoral organ system actually surrounds the vagina, urethra and anus. Rather than thinking of an orgasm as 'vaginal' or 'clitoral,' it makes more sense to think of orgasm in terms of the feelings that came along with it. In the end, an orgasm is an orgasm is an orgasm!」
「Here's a little bit of history for you: Sigmund Freud made a pronouncement that the 'mature' woman has orgasms only when her vagina, but not her clitoris, is stimulated — this is commonly referred to as the “vaginal orgasm”. The emphasis on stimulation from penetration made the man's penis central to a woman's sexual satisfaction. It is important to emphasize that Freud did not base his theory upon a study of woman's anatomy, but rather upon his assumptions of woman as inferior to men.」
「Back to the basics, stimulating the clitoris and (for some women) pressure in or around the vagina can cause pelvic fullness and body tension to build up to a peak. During sexual excitement, the clitoris swells and changes position. The blood vessels through the whole pelvic area also swell, causing engorgement and a feeling of fullness and sexual sensitivity. The inner vaginal lips swell and change shape, and the vagina balloons upward, causing the uterus to shift position. Orgasm is the point at which all the tension is suddenly released in a series of involuntary and pleasurable muscular contractions in the vagina, uterus, and/or rectum.」
[ https://goaskalice.columbia.edu/answered-questions/difference-between-clitoral-and-vaginal-orgasm 2017-05-01, emphasis ours ]

External source definitions …excluding politically incorrect concepts and other meanings deemed offensive today; may include extended definitions, euphemisms, and mnemonics)
Chinese: variant of 填
Japanese EDRDG: fill in, fill up, make good
Unihan extended: fill in, fill up; make good