1 definition by TQ.

The ability to guess a man's penis size after spending a few minutes with him.

Basically like a gaydar but with penis size.
Janet: Ooh he's packing heat, I just know it!
Emily: How can you tell that?
Janet: My dickdar. He totally has the personality of someone who is at least 7.5 inches.
by TQ. November 18, 2009
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