单词Y-fronts
n.: （前缝呈倒 Y 形的）男内裤网络: 缝有倒Y形缝的内裤；三角裤；男用棉质三角裤
（前缝呈倒 Y 形的）男内裤:
men"s underpants , with an opening in the front sewn in the shape of a Y upside-down