1 definition by Athena12

Stiffy

A slang word for erection or hard-on. As an erection is the 'stiffing' of the penis, a 'stiffy' is an understandable slang word. Normally used by children first discovering sexual things.

Ethan and I were discussing sex and he got a stiffy from thinking about it.

by Athena12 March 26, 2009