What does RFMF mean?
Read the Fucking Manual First
Other definitions of RFMF:
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How to use the term RFMF:
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More slang terms:

WDDD
Woopie Doo Da Dey

CUB4UDK
See you before you decay

KLK
Que lo que? (Spanish for What's Up?)

GTFA
Get The Fuck Away