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The face of suprise somebody makes when you abruptly shove something into their anus.
When I shoved my penis into her ass, she did a Big O.
Big O by SigiaZ August 25, 2011
Related Words
u do the big O today? u're all funny

many chinx were doin the big O back in the 19th century.
big O by big O November 26, 2003
Dirt cheap prices
big o by X April 29, 2004
1. An intense Orgasm let off by a female that squirts more than a foot away.
2. A Nice Oz of weed
3. The face she makes when she's riding a big black dick.
1. I got Jen to do the big o when i was eating her out last night, she almost shot me in the eye.

2. Hook me up with a Big o, i got a vaca from work- gonna smoke my brains out.

3. She must've liked it cuz she had a big o on her face the way she was moanin and screamin.
big O by Speciial Kay April 22, 2009
The awesomest man to walk the earth(Oliver), this term has become his title, and legend, after bringing pleasure to many women.
Who fucked her? Big O nailed that biatch!
Big O by AllofHer March 19, 2004
A slow cooker for the manliest of all men. Formally known as the gobbler, now less gobbly and more meaty. A grill that will make your neighbor jealous of your life. (hide your wife, lol).
You're so manly bro, you probably own a big O.
Big O by YoGobbleGobble May 28, 2019