Abbreviation for 'You Sick Fuck'.
I can't believe you dipped your balls in the pizza dough, ysf.
by Duane April 24, 2005
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Michael, YSF, you miss the whole point.
by Rudy1957 January 29, 2009
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You so fake
Dayum ysf

Dayum you so fake
by AlizzDaRealistt September 7, 2022
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YSFS means "You So Fuckin(g) Stupid"

Can be used as a way to get out of a conversation that you may not want any more part in, or can be used as a plain flat out roast, or someone who is generally just flat out dumb.
by burhhhhhhhh August 14, 2020
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