What is Troika?
1.
noun: a threesome. Technically a threesome of any kind, but more recently it has been used in a sexual manner.
Bob: "You look tired, what were you up to last night?"
Bill: "Remember those two girls from the club? We had a troika last night."
Bob: "Niiice..."
See
2.
A mounted turret in any FPS game, such as Gears of War, and Call of Duty.
"Hey guys, you see that? That's me on the troika"
"Wow, you mowed them down"