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TISNF has become the icon for preppy girls that never seem to stop texting, or have a valleygirl accent. TISNF stands for "this is so not fair" and is taken from a cell phone commercial campaign by cingular, now AT & T. used to imitate women in a sarcastic manner, usually when they flip out about something that's really not that big a deal, throw in a TISNF to get a laugh out of the guys listening.
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