What does GNST mean?
Good night, sleep tight
Other definitions of GNST:
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How to use the term
GNST:
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More slang terms:

BBFBBM
Body by Fisher Brains by Mattel is OK. But, about time to explain that Fisher designed cars and that all General Motor Cars had "body by Fisher" on it until somewhere in the 1990's. Something nobody outside the states is aware of. 2 bunnies shy of a hutch, a few clowns short of a circus, a tinny short of a sixpack.

IDGAC
I Don't Give A Crap

UR6C
you're sexy

YGPM
you've got a private message