Short for "you
know what I'm sayin'." Pronounced "ya kweese." Can be lengthened for effect. "ya kwEEEEEEESE." Not an internet acronym, but a truncated verbal form of "you
know what I'm sayin'."
Correct response to 'ykwis' is not 'ikwis (I
know what ya sayin') but another 'ykwis.'
"Damn, that bitch couldn't
keep her mouth shut in
class, ykwis ?"
Bob: "She can unfold my chair anytime, yaaaaaaaaa kwiiisss?"
Manfred: "ykwissssssssssssssss!"