Top Definition
When one sees another pull out a pack of gum, they can shout, "Shotgum," and automatically receive a piece of said person's gum.
Josh pulls out pack of Orbit gum
Steph: "Shotgum!!!"
Josh: aw man, now i have to give you a piece.
Steph: ALRIGHT!!
by downunderbear March 16, 2009

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