What does STUFU mean?
stupid f**ker
Other definitions of STUFU:
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How to use the term STUFU:
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More slang terms:

Happy Ending
A slang term for a massage that ends with the masseuse or masseur stimulating the client into orgasm.

FOAD
Fuck Off And Die

UJDS
u just did s**t

SWAFK
sealed with a friendly kiss