Top Definition
The scientific rule that states "If a girl has more than three tattoos, she'll probably take it in the ass."
1.) At first, I didn't buy into the Three Tattoo Rule, but eight years later and a few more romantic encounters under my belt, I'd have to say it's true.

2.) Cindy didn't disappoint. She was covered in ink and reaffirmed my belief in the Three Tattoo Rule.
by Blenderhead91 June 07, 2009
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