1 definition by Drexelsage

stiffie

the state a guy gets when sexually aroused; penis fills with blood and stands straight up and often makes a bulge through pants; boxers, etc. especially embarrasing for teenage boys who are turned on frequently and can't seem to control their boners

She was so hot that I popped a stiffie right there in class.

by Drexelsage January 3, 2004