Bus Willy

When a male is riding on a bus or automobile and their penis becomes erect, usually just before they need to get off/get out of the automobile.

"I sure hope Olivia isn't looking this way, because I have some serious bus willy."

by DeezNutsForPresident October 25, 2015

bus stop willy

A penis drawn badly in graffitti often drawn on bus stops.
Also reffered to as a BSW

"hey check that bus stop willy"

by J-Dawg + Br3sh July 1, 2007