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IGTN stands for I Go To Nerinx. (As in Nerinx Hall in Webster Groves.) It is basically an explanation for every bad thing that is happening or why you can't do something.
SLUH boy: "Are you off school today there's 12 feet of snow outside!"
Nerinx Girl: "No, IGTN."

SLUH boy: "You want to hang out tonight?"
Nerinx Girl: "I can't, I have homework unlike you. IGTN remember?"
by IGTNIGTNIGTN March 22, 2010
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