Fitted Boxer Briefs. Extremely tight underwear that shows the definition of a guy's manhood (package).
by Fi-Tdot February 29, 2008

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!!
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

by B. Leonard July 24, 2008

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!
My pants are too tight, there's no space in the trunk for the junk!
by John Preston June 29, 2010

by Stoinky Doink April 20, 2018

by One nice bun August 2, 2009
