Commonly used in the military, the practice of assigning more than one person to a rack/sleeping space, with each person occupying the rack in shifts. This system requires less berthing space on ships and submarines, for example.
The act of making out while the man is sitting, and the woman is straddling his legs. A combinations of the terms Straddle(n.) and Racking(v.) Often performed on a couch or the back seat of a car.
Guy1: "Dude did you and Emma get togetherlast night?"
Guy2: "Oh ya dude, we were straddle racking in the back seat of my car for half an hour!"
One of many pseudonyms for the Twitch chatter "rAccSSoo", combining the first 3 letters of his name ("rac") with "shit", in reference to another Twitch user "catsh" who goes by the name "catshit".