What does NNWW mean?
Nudge, Nudge, Wink, Wink
Other definitions of NNWW:
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How to use the term NNWW:
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More slang terms:

ICYDK
In Case You Didn't Know

OOYL
Out Of Your League

NTTFLS
Not Till The Fat Lady Sings

ALRIGHT
all right