It's an onomatopoeia
Fap: A sound effect for masturbation used often in japanese
comics.
Schlick:The sound associated with female masturbation.
lol no wonder when i checked fap on dictionary.com it came out
as "drunk".
i was like... "that makes hell no sense"...
and yux, how did u know that.
even 19 (20 in korean age) of life didn't teach me that
much 
