Lose it. It means go Crazy, Nuts, Insane, Bonzo, no longer in possession of one's faculties, 3 Fries Short of a Happy Meal, Whacko! "Window of Opportunity" Stargate SG- 1 The film Groundhog Day, which was partly an inspiration for this episode,
Use Kerplunk for classroom management. Start with all sticks and marbles. When a student breaks a rule, class is too loud, etc take out a stick. Class gets a 'reward' (sticker, S, green, whatever) if they keep all the marbles.