Wiktionary
a. Said of briefs with a flap at the front framed by y-shaped seams.
Usage examples of "y-front".
In her travels Nicola had often sat in shared bedrooms and cabins and boudoirs and powder parlours, and watched debutantes, predatory divorcees, young hostesses, even reasonably successful good-time girls shimmying out of their cocktail dresses and ballgowns to reveal some bunched nightmare of bloomers, tights, long Johns, Y-fronts.
In her travels Nicola had often sat in shared bedrooms andcabins and boudoirs and powder parlours, and watched debutantes,predatory divorcees, young hostesses, even reasonably successfulgood-time girls shimmying out of their cocktail dresses andballgowns to reveal some bunched nightmare of bloomers, tights, long Johns, Y-fronts.
Midway through the doorman's staged seconds of obsequious lechery, I noted in a hall mirror that my flyzip was broken and that pink-tinged Y-fronts now gazed sadly through the vent.
Already I am thinking in terms of selling my watch, wallet and Y-fronts, a spare kidney, the gold in my teeth.
Farrell in his Y-fronts sucking beer and watching hockey, but to this day, Y-fronts get me going pretty quickly.
When she added two pairs of SOU's bright red Y-fronts to the pile, it was the last straw.