Fitted Boxer Briefs. Extremely tight underwear that shows the definition of a guy's manhood (package).
I saw Scott walking around in his Junk Trunks and there was little left to the imagination.

by Fi-Tdot February 29, 2008
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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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Refers to the space in pants/jeans for the male genitalia. Think boxers vs. briefs, or tight pants vs. loose jeans.
I like to have plenty of space in the trunk for the junk. It's more comfortable.

My pants are too tight, there's no space in the trunk for the junk!
by John Preston June 27, 2010
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The act of busting of ones nut when pulling off a posh wank with a condom that doesn't fit
Bro, i pulled off an elephants junk trunk last night
by Stoinky Doink November 27, 2017
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1. Male Taint
2. The region between the Penis and Balls (Junk), and the butthole(Trunk)
1. Junk-trunk gap give it a slap.
2. He enjoyed a visit to the junk-trunk gap during orgasm.
by One nice bun August 2, 2009
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