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."
bus stop willy
A penis drawn badly in graffitti often drawn on bus stops.
Also reffered to as a BSW
Also reffered to as a BSW
"hey check that bus stop willy"