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1.
A shot in pool with epic proportions. When no ball is clearly sinkable, a shot with full strength is made with high hopes. If this shot is made and one of your balls is sunk, then it is referred to as an epic blastie.

It is also roughly used in other various sports or occasions involving alcohol.
"Yo, Blastie that shit."
"Blastie! Blastie! Blastie!
"Oooooooooooh! Epic Blastie!"
by kevin malky March 31, 2008