" That girl has a bad case of RBF!"
by Love_act January 6, 2017
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Root Beer Float
Best dessert ever invented

Totally doesn’t mean anything else
“I really want a root beer float

“Oh an RBF? Ya let’s make some!”
by pissjade September 25, 2021
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RBF=Resting Bitch Face. That means to always look either serious, mean, rude or bored when you’re face is neutral, or resting. But this doesn’t mean that people with RBF’s are actually mean, it’s just how their face was made :-D.
Alexandra always has a RBF on display, causing people to shy away from her.
by jawanna blowme? January 18, 2020
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