Top Definition
This is the theory that the average man will judge whether or not to try and sleep with a girl based on her circumference index.

If guy can put his arms around a girl and touch both of his elbows, he will certainly try it on. If not, he will find another girl to test the theory.
I'm going out friday night to test the elbow theory.
by Jmp85uk April 22, 2008

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