pfu Share definition Flag stands for pretty fucking ugly you see that girl over there... shes pfu pfu by john henry the 3rd September 8, 2006 Words you can keep railfan mug chonk mug chud mug based mug 67 mug slime mug mogging mug chopped mug thot mug glazing mug huzz mug yams mug larp mug unc mug cracked mug simp mug baddie mug bop mug lolcow mug