What does RBF mean?
Resting Bitch Face - When you naturally relax your face and your expression makes you look angry, upset or displeased.
Other definitions of RBF:
Really Bout to Fight - a popular expression used in New Jersey when a situation becomes tense.
Really Bad Friend - Someone who claims to be your friend without demonstrating friend like qualities.
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How to use the term RBF:
"Sorry if I look unhappy when I'm not smiling. That's just my RBF."
"Did you see those drunk guys? They're RBF out here."
"Wow! Lisa is the definition of an RBF."
More slang terms:
positive mental attitude
Every Man a Wildcat