Top Definition
When one female is present with many males preparing to enter a vehicle, the female gets shotgun due to the presence of boobs. If there is more than one female present then the female with a larger size gets shotgun
Mel: SHOTGUN!
Bruce: sorry bro Anne is here she gets it
Mel: What?Why?
Bruce: Dude Boob Rule, duh
by Gingerdick December 23, 2009
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