Pop a stiffy

When you have a sudden increase in blood flow to the penis from sexually arousing scenarios which causes the penis to puncture a hole through the article of clothing in which the stiffy is concealed.

Pop a stiffy mate.

by Chode Buster May 21, 2011

Pop a Stiffy

A way of stating that the male penis is soon to ejaculate. Otherwise known as a boner.

I Pop a Stiffy everytime I get to walk behind Payton

by Blevinz11z May 31, 2012