A buckshot belly buster is when three guys will give their high school bullys' sister an Alabama Squeezebox while the 3 will watch while fingering himself. Then when she is tired all three of them will try to squeeze all their Penii into her vagina or anus while performing an Alabama Crabdangle.
Guy 1 : remember Billy our bully from school?
Guy 2 : Yeah, he sucks.
Guy 3 : We should perform a Buckshot Bellybuster on his sister!
All : Hell yeah!