What does HLOL mean?
Hysterically Laughing Out Loud
Other definitions of HLOL:
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How to use the term HLOL:
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More slang terms:

THX
Thanks

JOHN
A slang term for a prostitute's clientele. From the intentionally anonymous name for a man "John Doe".

FTC
Favorite, Thumbs up, Comment

CSL
Can't stop laughing