Y-fronts

British  

plural noun

1. boys' or men's underpants having a front opening within an inverted Y shape

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Example Sentences

Croatia's Let 3 will perform as the penultimate act and end their performance in y-fronts.

From BBC

As a funky counterbalance, he showed rubbery translucent flasher raincoats worn over what looked to be Y-fronts; shearling coats with innards exposed; and T-shirts, their fronts printed with faces, pulled up over models’ heads — a pretty direct quotation of those created by Matthias Vriens a decade ago for his label BL33N and sold at Colette.

From New York Times

He picked up my discarded Y-fronts from the floor and held them open with his splayed thumbs.

From The Guardian

"We're not keyboard warriors sat with our little y-fronts on, we're elected members dealing with people's issues," he said.

From BBC

The male swimwear - often simply referred to as Speedos or budgie-smugglers - is essentially a waterproof pair of Y-fronts which are very fitted.

From BBC