Peen Share definition Flag 1. Derivitive of the word penis. There was an intoxicated man dancing on the train with no pants on, his peen was flopping around everywhere! Peen by Tashimama December 7, 2006 Word of the Day on December 4, 2019 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