Tarkoving is a sexual position that involves 2 of the same sex. One person spreads his glutes while the other person proceeds to stick their entire hand into their anus. This is usually done without warning and is a surprise to the one getting tarkoved.
Person 1: "Yo me and my homie we're tarkoving last night"
Person 2: "Did you guys make it out?"
Person 1: "Nah I blacked out his legs"