What does NTHN mean?
nothing
Other definitions of NTHN:
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How to use the term NTHN:
There are no example uses of NTHN at this time. We would greatly appreciate your contribution if you would like to submit your own!
More slang terms:

RAGO
Whatever, OK

NPA
not paying attention

RADAR
Radio Detection And Ranging

OGTDA
One good turn deserves another