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1.
The muscle in a woman's tummy that contracts during an O.
Dude: Is that a six pack?
Chick: No, it's a highly toned O Muscle.
by B.B. Smith September 02, 2008
 
2.
The muscle in a woman's tummy that contracts during an O.
Dude: Hey, you have a six pack.
Chick: No I don't, just a highly toned O muscle.
Dude: Well, let's pour some honey on it. . .
by B.B. Smith August 15, 2008
 
3.
The muscle in a woman's tummy that contracts during an O.
My law partner has a remarkable O Muscle.
by B.B. Smith September 05, 2008
 
4.
The muscle in a woman's tummy that contracts during an O.
Mr. Smith: You have a six pack.
Miss Smith: No, it's just a highly toned O Muscle.
by B.B. Smith October 09, 2008