A young gang in mayfield that are so scared that they use weapons a get there olders to fight there battles
Guy Number One: I just shit my pants
Guy Number Two: yfs?
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Meaning Your fucking stupid
Person 1: I GOT THE NEW IPAD!!!!
Person 2: YFS u bought an oversized iPod touch.
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noun - Yuh (you) Faggot. A light-hearded funny way of calling someone a Faggot.
Paul is acting like a YF, what's his problem? Chief YF where are you?
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Young fieldies a young team from Mayfield hardest cunts gawn
After smashing people from gilmerton or widburn they would say "YF YA BAM"
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