Gibbous Share definition Flag The state of a penis between a semi and a full blown erection. I was so drunk, she had to make do with my gibbous Gibbous by rich wazza March 11, 2007 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