once-a-weeker Share definition Flag Somebody who is very inexperienced at a sport. When somebody who plays a sport 24-7 and messes up, can be called a once-a-weeker meaning a scrub. Tennis player-'Hits shot in the net' Coach-'Dont miss that shot. Your such a once-a-weeker.' once-a-weeker by laxplaya256 May 29, 2010 Get the once-a-weeker mug.