When you do something amazing that would normally take more than 4-5 people.
In Modern Warfare 2:
Guy 1: "Hey you just killed the entire enemy team in Ground War!"
Guy 2: "I know, I'm a one man gangbang!"
14👍 5👎
When one man starts a gangbang and no one taps him out because he's just that good.
Amanda: Hey look at Billy go
Sarah: Yea, he's a regular one man gangbang
Or
Amanda: hey Sarah how's your ass feeling today?
Sarah: Surprisingly not bad after having Billy, The One Man Gangbang. He's gentle!
5👍 3👎