Blass Share definition Flag Short for bootyliscious ass. Specifically referring to a bangin' white girls ass. Damn! That Brit has the most Blass in London. Blass by mulletman March 23, 2012 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