Buttstroke

So in the Star Wars D6 campaign Rebellion adventure Scavengers, Lee's character Hack mouths off to the guards and one hits him with the butt of his blaster rifle, which is a buttstroke, but no one else knew that, so for the rest of the night, it was all sexual innuendo such as:
Mike "He buttstrokes you, running his hand down the curve of your butt"

Ever since then, Mike tries to work a 'buttstroke' comment into almost every game session…