meaning "for sipping", a girl/guy who is too classy to just fuck and forget about, but someone you want to enjoy slowly, like a shot that isnt for shooting, but 'fa sippin'.
ooh, girl, he is fasippin.
you cant look at my sister like that, she's fasippin.
to pick every last morsel of meat off a carcass, letting absolutely none go to waste.
boy, dad sure dechenne'd that turkey.