To be HELD UP FROM BENEATH:「flow with trust, confidence」in water and air occurs because of buoyancy, as surrounding matter (water, air, a pair of hands) HOLDS UP FROM BENEATH, in other words, FLOATING.「Flow of maggots with meat」appear as froth with waves of larvae seemingly HOVERING above the meat, but of course the meat is HOLDING UP the maggots.
　As「flowing jism in meat with confidence」or「flow into meat of trusting child」are the hands of an adult male HOLDING A CHILD OVER HIS MEAT and forcing a「many times flowing」bouncing, bobbing motion of the child upon his erection: FLOATING, BUOYANT, HIGH SPIRITS, HOVER, LEVITATE, SUSPEND ABOVE. SUPERFLUOUS of course literally refers to a「super flow of fluid」that is more than necessary under the circumstances when「fluids flow with repeatedly bobbing child and emphasis on emissions」or「meat with child」(see 好, what is liked):「In traditional Chinese medicine, there has never been a mental disease called pedophilia (or an equivalent term), or homosexuality, or most of the other so-called sexual variations for that matter. …Children are usually described as natural sexual beings and erotic stimulation and sex-play are seen as beneficial to their healthy development.」
　　[　https://docx2.com/wp-content/uploads/Are-Any-of-the-Pharaphilias-in-DSM-Mental-Disorders_.pdf 2023-05-14　]　
　And finally, meaning SLUT (the male or female variety) perhaps as depicts the FLOATING, BUOYANT, HIGH SPIRITED feeling from schtupping (ejaculation into a birth canal or other attainable orifice) complete strangers with complete「confidence」anytime, anywhere, with anybody (male or female) trusting that nothing is ever the matter, HOVERING ABOVE the accepted social norms while stewing in various bodily fluids and「being confident about those fluids」by believing (falsely at times) that no sexually transmissible diseases will head your way.「Flow with meat maggot」applies to a SLUT of either sex. After considering the elements as describing the use of a child as a sex toy, the other listed meanings ought to become intuitively obvious.

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: to float; superficial; floating; unstable; movable; provisional; temporary; transient; impetuous; hollow; inflated; to exceed; superfluous; excessive; surplus
Japanese: float, buoy, to float, to become merry, to be cheerful, to become loose, to become unsteady, to feel out of it, to be cut off, to feel out of place, to be frivolous, to be uncertain, to have left over, to be saved, to have no basis, to be unreliable, to be suspended, to rise to surface, to come to mind, to have inspiration, light, amorous, flamboyant, to save, to scrimp, to half-rise, e.g. to one's feet, carelessly, thoughtlessly, inadvertently, to be fickle, to be flippant, to be flighty, to be giddy, to be restless, to express, to look, to think, to imagine, to remember, to make merry, to be festive
Unihan extended: to float, drift, waft; to exceed; superfluous
EDRDG: floating; float; rise to surface

Used within names (nanori)
うき