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Having sex with one's anus to the point where the anus and colon become distended, and protrude out of the body, and then performing oral sex on the length of protruding anus.
Me and Charlize were stone cold trunkin'.

Nathan is a good guy because he knows how to trunk some anus.
by Dr. Turbo April 09, 2005
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2
To wave your penis up and down in front of a females face in such a manner were it seems like it is an Elephants Trunk.
"I was trunking this girl last night, it was totally awesome!"
by ZuFe December 01, 2011
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3
a shenanigan in which a teenage miscreant sneaks up to a stopped car at an intersection and opens the trunk of the car. a sucessful trunk happens only when the door is unlocked and the trunk opens.
Last night we went trunking and opened 4 guys trunks!
by Ninja Guin May 06, 2009
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4
When a man puts his foreskin on a woman’s nose and subsequently pulls his penis back, creating a vacuum. When the foreskin slides of the woman's nose, a popping sound is created. Based on Disney’s Dumbo, where the jailed mother elephant hugs Dumbo using her trunk.
Whereas my former gf enjoyed a cozy dickslap now and then, my new one is deeply into trunking.

Dude, that hipster chick you hooked me up with made me trunk her before she would go to sleep.
by RdBr December 05, 2011
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5
to consume cocaine by allowing it to permeate through the foreskin of the penis,
"G dub, Buzzsaw, Tha Wind an' me were trunking an eight ball at Vito's last nite."
by Mother Trunker November 14, 2008
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6
The latest craze amongst American teens when there are too many bodies to conventionally fit inside a car - the extras go into the car trunk (or boot if you speak British English).
Yeah, man, Mark and I went trunking last night, because there were 8 of us, and damn his feet stink!
by Doc Tinfoil Hat June 17, 2006
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7
Trunking or the act of Trunking is when one person gets in the trunk of a car, and at the right moment, pops out and scares/surprises the nearest people. Trunking usually occurs in parking lots at parked spaces, however can be done anywhere. The main goal of Trunking is not to harm, or scare, rather than to observe the reactions people will give you!
Tim: OMG LETS GO PLANKING!
Mike: No bro, trunking people is better, its the newest trend.
Tim: Oh I saw that shit! Lets do it!
Mike: Hell yeah.
by Trunking Creator July 24, 2011
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