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1.
Humorous reference to a brassiere.
Damn, Frank shagged some fat chick from the party. He almost got away with it, but his folks found her double barreled slingshot under the couch.
by Frank Klaune March 29, 2005
 
2.
a brassier (jocular, from the shape)
Whoever hung that double barreled slingshot out here must be fat. Talk about streched out.
by Light Joker December 08, 2006