peepoo Share definition Flag when your sack is put over your butthole and an arrow is shot threw it. someone with asshole qualities or is being a real dick head. Dont make me peepoo your ass! Eric was being a real peepoo the other day. peepoo by John July 24, 2004 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