Backwards thunderthumb

When someone sticks their thumb backwards in your butthole and they fart on your thumb...thus the thunder sound.

I totally want to give Miley Cyrus a backwards thunderthumb.

by Sexy Angel 6969 April 22, 2009

thunderthumbing

thunderthumbing the art of scwhhhiiiinging ur thumb in a crane like manner directly aimed at ur partners bum bum hole to create panic and disturbance hahahaha

i chased him with my thunderthumb seeking his butthole ...thunderthumbing

by trixta74 December 10, 2016