Engaging in axillism (male masturbation with an armpit belonging to either sex) as axillary intercourse, bagpiping, coitus axilla, huffle, huffling, penis-to-armpit intercourse,「a pit job whilst holding one's face down in a head-lowered position」will likely result in some spatter striking one's CHEEKS eventually, USING A CLOTH UPON ONE'S FACE, and the best-practice during climactic moments of SHUTTING ONE'S EYES as a defensive reflex against flying flecks.
　「One on each side of your head with face downward」are CHEEKS, although while looking downward one's facial cheeks are not readily visible…so maybe these are another kind of cheeks? CHEEKS can do some「squeezing with head in downward position」of meat placed inside the mouth orifice, and of food, too. A jaw with molars within cheeks that squeeze on each side in order to chew.
　With a LOINCLOTH ON ONE'S HEAD, logic infers the head may be positioned in a crotch viewing CHEEKS or inserted between them…or preparing to do so, squeezed cheek-to-cheek as it were. Perhaps FEIGNING IGNORANCE refers to have one's head between one's own buttocks cheeks inside the loincloth with face down, i.e., HAVING ONE'S HEAD UP ONE'S ASS, ignoring the obvious.「Big spurting with head facing down」watching the action of giving oneself a selfie…appearing a bit IGNORANT, and again assessing the need to dodge flying flecks or close one's eyes momentarily.
　Note that in the modern age, wearing one's underwear upon one's cranium [head] as a covering rather than covering the glans [head] is generally frowned upon, and in most instances will not yield the desired effect, unless the desire is to spend the night in jail with other buddies wearing their loincloth on the upper head while leaving the lower head exposed. Nevertheless, it remains a fine way to FEIGN IGNORANCE. Placing soiled underwear over the head of a child as punishment, as a means to discipline IGNORANT behavior, that of ignoring the fact one needs to apply bunwad after defecating, at least once per session.
　Without a doubt, the Irish also have knowledge of their own to pass along in these trying times:「Masturbation will not spread coronavirus, especially if you wash your hands (and any sex toys) with soap and water for at least 20 seconds before and after.」Nonetheless and regrettably, unlike in dynastic China, it must be undertaken alone to truly be a preventative countermeasure but still achieve the desired result with some degree of safety.
　 　[　https://www.sexualwellbeing.ie/sexual-health/sex-and-coronavirus/ 2020-03-31　]　
　The Dutch, too have the same solution—it seems masturbation has become mainstream in the media the world over due to the coronavirus (it has always been 'the main stream' in reality, albeit covertly for most folks):
　「'Don't have sex with your partner if they have been isolated because of (suspected) coronavirus infection,' the RVIM says. 'Sex with yourself or with others at a distance is possible (think of telling erotic stories, masturbating together).'」
　　[　https://www.theguardian.com/world/2020/may/15/dutch-official-advice-to-single-people-find-a-sex-buddy-for-lockdown-coronavirus 2020-05-16　]　
　Needless to point out perhaps, but Chinese shamans from antiquity hit upon the same solution as a pandemic preventative countermeasure, honed for ultimate client satisfaction by utilizing naked females with no-longer-integrated feet as masturbatory sex buddies available for short-term rental with erotic visualization of live prepubescent female genitalia engaging in autoerotic stimulation herself, as a solution to the same problem facing us now, but in pre-Internet days.

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: variant of 頰|颊
Japanese: face, mug, surface, surrounding area, cheek, cheeks, covering one's head with a handkerchief, scarf, etc., tying a cloth around one's head, feigning ignorance, shutting one's eyes
Unihan extended: cheeks, jaw
EDRDG: cheeks; jaw