1) (n) used during conversation to convey a mood of "simply not giving a fuck".
2) (n) put after a word to convey disrespect and disregard for the previous word. i.e. bananasK
3) (n) shortened form of "okay"
1) A: why does it seem like you never listen?
B: k
2) A: hey, did you hear the new Trippie Redd album?
B: trippiereddK
3) A: I need you to help me with this question?
B: k