Mud flaps Share definition Flag Derogatory statement describing a girls vagina. You can picture it if you'd like. "How was she?" "Decent. .. Hell of a lot of mud flap down there though." Mud flaps by Balls November 14, 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