Definitions by satanic.apple

Invisible boner 

when a guy's penis is so small that when he has an erection you will not be able to see any type of bulge going on unless he is fully naked and even that's barely visible. this man looks as if a 5 year old's penis was attached to man.

Hey, did you see that guy in the locker room? he had an invisible boner going on!

Invisible boner by satanic.apple October 31, 2016