A command on Irc(Internet Relay Chat). It stands for kick. It is used to kick a person from a channel whether its yourself,which someone named otns does alot, or someone else. People annoy people and normally they pms and !k someone.
@otns> !k * You were kicked from #otnsx by X (Requested)
@Hand_of_God> That kid kicked himself using !k LOLWUT.