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Simmer
The
Fuck
Down.
Class: Oh boy! We get to watch JFK's assassination video?!
Teacher: Yes children, but if you don't STFD, you won't pass your first year of pre-school.
by NotSoFast! August 12, 2010
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Simmer The Fuck Down

The need of chilling out
<Wes> Who just broke the pot I was spinning?
<Matt> You know what? You really need to STFD! and stop worrying, it sucked anyways.
by BryanZ April 29, 2008
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STFD is an acronym to simply say SLOW THE FUCK DOWN. This wonderful acronym comes from a musical called Come From away which I suggest you check out.
And if they're speedin', I'll stop them and write out a warning ticket. I'll write STFD
Slow the fuck down!
by DoodlesfortheDay August 07, 2019
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WHEN YA GIRL ASK FOR A DATE AND YOU DONT FEEL LIKE SPENDING MONEY ON HER SO "STFD"
by M_ANON July 13, 2019
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