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(pronounced "I sniffed") The acronym for "I say nah fuck dat!"

Something said when one feels like actin' a foo' but, due to the situation or circumstance, cannot.
Bouncer: the cover's five bucks.
You: isnfd up in dis...
Bouncer: what was that?
You: nevermind, okay here you go.

Boss: all in favor say...
You: ISNFD!
Boss: what does that mean?
You: just keepin' it real.
by Bevglog January 27, 2011
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