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Means "I don't know". A shortened form of "IDK, my BFF Jill?" from the Cingular commercial. Mom: "Beth Ann!" Beth Ann: "WU?" (What's up?) Mom: "Your cell phone bill is what's up. All this texting!" Beth Ann: "OMG, INBD!" (Oh my God, it's no big deal!) Mom: "It is a big deal. Who are you texting 50 times a day?" Beth Ann: "IDK, my BFF Jill?" (I don't know, my best friend forever Jill?" Mom: "Tell your BFF Jill that I'm taking away your phone." Beth Ann: "TISNF!" (That is so not fair!) Mom: "Me paying this bill, that's what's...S...N...F!"
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