poon stache Share definition Flag When someone eats a girl out with a yeast infection and gets yeast on there lip and it looks like a milk stache. "Got Yeast?" "Yes I Do Infact, Check My Poon Stache!" "Quite Rad." poon stache by Brazzle Magazzle May 18, 2006 0 0 Get merch Get the poon stache mug. Buy Now — $32.95 See more merch