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the act of smoking (particularly marijuana) in the trunk of one's car and letting the fumes accumulate in the small space in order to obtain optimum intoxication; to hotbox one's trunk
"Pass me the bong and pop the back, I'm trunkboxing this shit."

-"Yo let's roll."
-"Can't. Jack is still trunkboxing the back."
by emcfm November 07, 2010
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