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
Get the Doing the big one mug.
Do your big one mean like , your gonna do really good or go all out with the next person or task.
“I’m gonna do my big one on him

Yea girl you got you one.
by 2t4L September 21, 2023
Get the do my big one mug.