Slang, synonym of callipygian. Implies an oversized buttocks, disproportionate to the waist or the rest of the body. Usually complimentary.
"Look at Keisha's ass... Man, she has some junk in the trunk!"
by this-is-ridiculous August 22, 2008
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1. A really nice ass, usually affiliated with black women.
2. Sex
1. Damn that chicks got some junk in the trunk!

2. ... I put my junk in her trunk...
by MaximumOverdrive October 18, 2008
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:a project chick that has a shapely ass and a small waist. a round jiggly ass.
You can tell Keisha has junk in the trunk by the way she's throwing dat ass from side to side.
by vinchap February 15, 2005
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A large bottom, especially when the person attached otherwise attractive.
She is pretty cute, but she's got a lot of junk in the trunk after eating dorm food all year.
by VAKI5 May 8, 2005
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The act of having anal sex for so long your balls penetrate as well.
Man 1: Man my dude my balls are sore.
Man 2:Why?
Man 1: Cause I was fucking a chick in the ass and I then my balls slipped in.
Man 2: A JUNK TRUNK?! MY MAN! YOU JUNK TRUNKING SON OF A BITCH!!
by Painfullee September 5, 2018
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Anal sex. Junk=genitalia Trunk=Butt
Junk+Trunk= Junk in the Trunk
He likes to put his junk in the trunk
by Keloid Conquerer January 25, 2010
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