|1.||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.
|2.||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