Wiktionary
n. (context plurale tantum English) A combination between boxers and briefs
Wikipedia
Boxer briefs (or tight boxers) are a hybrid type of men's undergarment which are long in the leg, similar to boxer shorts, but tighter-fitting like briefs. Depending on the manufacturer, boxer briefs may also be spelled as one word: boxerbriefs. They are sometimes called " trunks" in the United Kingdom and Australia.
Boxer briefs were pioneered by designer John Varvatos during his 1990–1995 stint at Calvin Klein as head of menswear design. Made famous by a series of 1992 print ads featuring Mark "Marky Mark" Wahlberg, they have been called "one of the greatest apparel revolutions of the century". Of their creation Varvatos said in 2010, "We just cut off a pair of long johns and thought, this could be cool..."
Usage examples of "boxer briefs".
He was standing in his boxer briefs, a tee shirt over his head as he hadn't finished dressing.
Her heart stopped beating as she saw the size of the swell of him underneath the thin white boxer briefs.
Tad had pulled on a pair of boxer briefs and was reclining on the bed again.
The blankets had shifted out of the way enough that there was only denim and two pairs of boxer briefs between them, and as they moved it was suddenly far too much fabric.