What does EFG mean?
Epic Fail Guy
Other definitions of EFG:
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How to use the term
EFG:
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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.

DFE
Dead Fish Experience

LLS
Laughing like shit

RTFMA
Read The Fucking Manual, Asshole