A drinking game that Bullmoose is called when someone is holding a beer with their dominant hand. The "victim" must then down their beer.
by Jesse Hoisington February 20, 2007
If a player is caught drinking from his or her right hand, and another player calls "bullmoose" on him or her, he or she must then chug their drink. If they finish it with their right hand, and another player "bullmooses" them on their "bullmoose", they must chug another one.
by WBlake January 16, 2006