Top Definition
"Yaaaay, I'm not pregnant" - the acronym YINP is a way for girls who feel a compulsive need to tweet about their periods, to announce that their period has started, without actually having to describe their vaginal discharge.
"After spending every night last week at John's house, I was worried, but today, YINP!"

"John wants me to come over tonight. He'll be disappointed, but at least YINP"
by SteveWin October 14, 2012

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