A Double daboosy dare is similar to the triple-dog-dare, you should not / cannot back down from it, however unlike the triple-dog-dare you can be given an alternative which MUST be worse than the origional dare.
Mark: I double daboosy dare you to go to town dressed in drag
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.