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When two or more guys are hanging out and a hot girl walks in, one might exclaim 'Boob Shotgun!'. This is related to two people walking to a car and one calling 'shotgun', therefore claiming the passenger seat. Exclaiming 'boob shotgun' means to call dibs on a girl, especially of the boobs.
Greg: Boob shotgun!

Bob: Damn. I wish I'd seen her first. That girl is smokin!
by RockStarGirl July 24, 2011
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