What does LTMSH mean?
Laughing unTil My sides Hurt
Other definitions of LTMSH:
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How to use the term LTMSH:
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More slang terms:

PLOKTA
Press Lots Of Keys To Abort

ROTFL
Rolling On The Floor Laughing

LOFL
laugh out f**king loud

TTYAWFN
Talk To You A While From Now