look up any word, like hipster:
1. Another name for Sexual intercourse
2. Intense sexual intercourse
3. Kinda like "doing the nasty" but different name
4. Fucking every day all the time
Steve has sex every day, so he's doing the big one

John's in another room, and you hear humping. He's doing the "big one".
by cguy20 April 17, 2010