flash boner

an erection that last under 1 min.

bro 1: dude was that ur mom

bro2: yea

bro1: ok because ur sister just gave me a flash boner.

by Erin Mcracken November 13, 2009

Flash-Boner

A boner that arises immediately from the presence of a really hot chick or some female body parts on serious display.

"Jessica walked in wearing a thong and a push-up bra and immediately I had a flash-boner."

by Dan_07 October 26, 2011