Thunder Fap

In the act of masturbating to online pornography, when your hand reaches the top of your shaft and slams the desk and creates a thunder-like sound.

person 1: Is it storming outside? I hear thunder but I don't see any lightning.

person 2: Oh that's just John in the next room over thunder fapping. He must be watching some good stuff.

by Spilner May 5, 2011

Thunder Fap

The act of fapping very loud and quickly, much like thunder.

Is that a storm, or is my roommate just thunder fapping?

by pimpassnigga September 11, 2012