Pants Moustache Share definition Flag An overgrown bikini line that's sprouting out either side of the underwear. You should really get down to the waxing parlour and get that pants moustache seen to. Pants Moustache by Anja_Antares November 12, 2010 0 0 Get merch Get the Pants Moustache mug. Buy Now — $32.95 See more merch