A trunk beer is a rare form of beer, which for reasons passing understanding, has been aged (forgotten about) in a friend’s trunk only to reappear and become highly desirable when booze is scarce. Common trunk beers include Miller Lite, Bud Light, Keystone Light, and PBR.
Hatham showed up late to the game and forgot beer so we had to break into a fresh case of trunk beer Weston had in his car.
by John Skinz June 14, 2012

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