Grandma's moustache Share definition Flag The act of pulling down your pants and underwear to expose roughly the top inch of your pubic hair. Pull your pants up, dude! I can see your grandma's moustache! Grandma's moustache by monkeybrainss December 16, 2009 0 0 Get merch Get the Grandma's moustache mug. Buy Now — $32.95 See more merch
