What does LSMIF mean?
Laughing So Much I Farted
Other definitions of LSMIF:
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How to use the term LSMIF:
There are no example uses of LSMIF at this time. We would greatly appreciate your contribution if you would like to submit your own!
More slang terms:

ANIM8
animate

FGT
Feeling Great Today

HICA
Here It Comes Again

YTMBA
You Take My Breath Away