A derogatory term for a straight man who enjoys anal sex with other men. Usually used among friends in the case where one friend makes note of his bi-curiosity or that one-time homoerotic experience in college.
Guy 1: Did you hear that Kevin got a blow job by a trans guy at a party?
Guy 2: whaaaat?
Guy 1: yeah apparently he picked him up at a bar and thought it was a girl - kept going even when he found out it was a guy though. He was pretty drunk...
Guy 2: wow. What a butt boxer.
Guy 2: whaaaat?
Guy 1: yeah apparently he picked him up at a bar and thought it was a girl - kept going even when he found out it was a guy though. He was pretty drunk...
Guy 2: wow. What a butt boxer.
by The Butt Doctor October 11, 2016

A pair of loose fitting, flowy boxers. These boxers, when worn for an extend period of time with jeans ride up into the subject's butt crack and up to the hips, creating in unintentional thong.
by Big Teetz January 15, 2009

by tetley80 October 1, 2007

Guy 1: Man my fucking junk hurts!
Guy 2: What the fuck happened?!
Guy 1: I got Boxer burn! My girl dry fucked me so hard last night...
Guy 2: What the fuck happened?!
Guy 1: I got Boxer burn! My girl dry fucked me so hard last night...
by Darrn April 14, 2014

When a guy wears skinny jeans, is wearing a belt, and still has his pants sagging...the big fluffy wad of boxers hanging out of the top of his skinny jeans is the "boxer mushroom."
by crystaloney April 21, 2010

by yargh September 6, 2005

by Daniel shaw May 20, 2008
