When an erection occurs involuntarily in response to an inappropriate stimulus and a conflict between logic and biologic arises resulting in a state of terror, embarrassment or squirmyness.

This condition arises predominantly in situations where the catalyst is vile, repulsive or undesirable and against all better judgement, you get an erection.
A Squirm Boner occurs when:

A nasty trailer trash dance-queen drunk on lady's night well-drinks uses a fist of sausage fingers to grope your junk on the dance floor.

When you realize the sexy asian girl you are fapping to is actually a boy

when your cousin is forced to sit on your lap in the back seat of your dads car while driving on a bumpy road.

When you accidently brush up against a 90 year old woman in a swimming pool.
by eats tribbles October 19, 2011

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