Stands for "over-the-knee spanking." It comes from a subculture known as BDSM, SM, or S&M. It is usually used by a Dom/Domme to punish a sub (or, depending on which way you look at it, arouse a sub). Pretty much self-explanitory; a spanking given while the sub flipped over the Dom's knee, much like you would spank a child.
sub: "N-n-no Sir!"
Dom: "What? 'No, Sir?' --get over here for an OTK!"
over the knee, as in spanking
-Daddy, I don't want to do that right now.
-Do what I say bitch, or you're getting an OTK spanking!
A One Turn Kill (OTK) is achieved when a player wins a Duel in the space of a single turn, as soon as said player has the appropriate cards in hand and has control over the duel. This is similar to a First Turn Kill, but the latter is pulled off during the player's first turn, while an OTK can be accomplished at any point of the duel (meaning that all FTKs are OTKs, but not all OTKs are FTKs).
Kaiba: Ha! In three turns, I shall summon my Blue Eyes White Dragon and decimate your remaining life points!
Yugi: Perhaps, if victory were not within my grasp this turn. Prepare for an OTK!
Original Trendsetta Krew
I need some more of that O.T.K music in my life
Out To Kill. A dangerous gang originating in Mont Albert.
The gang was formed by OG Richard Dong (aka Ricky D)
John Lee:... fuck you
Ricky D: I'll get OTK on you
John Lee: Whoah relax man
An infamous krew in Victoria that stands for out to kill.
Where have you been?
With OTK kacoking
over the knee - as in boots that rise above the knee.
Traditionally thought of as racy and kinky, this fall (2009) the mainstream shoe stores are well stocked with OTK boots.