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!"