an erection so hard that it stretches the skin of the scrotum pulling the testicles against the shaft.
When your mom gives your sister a hug and kiss it gives me a scrotum boner.
by Graven Sevagorn August 24, 2010
Type your email address below to get our free Urban Word of the Day every morning!
Emails are sent from email@example.com. We'll never spam you.×