Doing the big one

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".

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do my big one

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.