rbf Share definition Flag resting bitch faceWhen your face makes you look like a huge bitch! She was nice but had an rbf that made her look like an asshole rbf by jennasea June 30, 2017 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