A fork of Rural Dictionary
Clenching and unclenching your buttcheeks as if there was a Mars Bar jammed inbetween them. This is to ensure you keep the blood flowing when standing still for a long period of time.
Instructor: To keep the blood flowing don't forget to eat a Mars Bar. Don't fully eat a Mars Bar, and don't produce a Mars Bar.
An abbreviation of "what is this" or "what's this"; used when you're too lazy to write or say the phrases mentioned
Father: Wuzzis sonny boy? sonny boy: what?