Abbreviation for 'You Sick Fuck'.
I can't believe you dipped your balls in the pizza dough, ysf.
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(S)uper (w)ild (a)ss (g)uess, as in an off-the-cuff estimate of effort to achieve some result. Used frequently in the application software industry, to guess the amount of work it would take to introduce a piece of functionality into a software product.
The 'swag' for implementing your feature is 10 days.
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