What does YLB mean?
you little b***h
Other definitions of YLB:
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How to use the term YLB:
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More slang terms:

PAW
Parents Are Watching

SOSDD
same old s**t, different day

Mullet
Refers to a hairstyle where the hair is longer in the back than on the top, with the sides often kept short.

CML
Call Me Later