A man who sucks up to the boss to try to get ahead at or keep their job. The ballwasher will stop at nothing to keep their job and all morals go out the window. The term BALLWASHER is especially wide spread in the philadelphia area trade unions where bum tradesman who suck at their job will ball wash with a smile.
Guy #1: Yo bro, did you see dave bring donuts and coffee in for john this morning?