What does LRFL mean?
Laughing really f**king loud
Other definitions of LRFL:
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How to use the term LRFL:
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More slang terms:

PMP
Peeing My Pants

MMO
Massive Multiplayer Online - referring to a computer game that connects sometimes millions of players to an online gaming platform / community.

FGJ
For Great Justice

YMMS
You Make Me Smile