What does ROFLMBO mean?
rolling on floor laughing my butt off
Other definitions of ROFLMBO:
- Rolling On the Floor Laughing My Balls Off
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How to use the term ROFLMBO:
I'm rolling on the floor laughing my balls off
More slang terms:

AWLTP
Avoiding Work Like The Plague

PPU
Pending pick-up

GOFLAG
Great oaks from little acorns grow

HI2U2
hello to you too