What does BRBRB mean?
Bathroom, be right back
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BRBRB:
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More slang terms:

C-Cup
A reference to the bra cup size. While some may believe this is the average or "best", two complications come to mind: 1) the average is hard to determine for various reasons, as it has increased over time, some women are wearing incorrect sizes, and different brands size differently, etc. And 2) this is all subjective. Some people like smaller, some larger.

WAYDRN
What are you doing right now

YFB
you f**king b*****d

SO
A slang acronym for "Significant Other", a relationship partner.