A replacement for the f-bomb when parents/teachers/Jesus is nearby. Can be spelled with one or two F's at the end (not that you'd ever need to write it down).

The comical value of using this is great - from a distance it sounds exactly like "the big one". A quick explanation later and "blammo!" you got yourself a new classroom word.
Teacher: Has everyone got their novelisation of the the screenplay "Alabama Chainsaw Massacre"?

Cool kid: Oh, fuff!

Teacher: WHHHHHAAAAAATTTT???!!!

Cool kid: It's coo' maan. Chill your fuffin' ass.
by AforesaidCoolKid September 23, 2007
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When you feel a bit down, but your not quite upset yet. Its a expression to use if your a bit tired as well.
by Abii October 4, 2007
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Ex. 1

Johnny: I'm going to die if I can't pee now!

Mom: Oh, fuff! You can wait until the next rest stop.

Ex. 2

Teacher: And now you have to write a 10 page report.

Jimmy: Awww, fuff! I didn't even read the story!
by AHUGECOCKSUCKINGFAGGOT February 18, 2014
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adj 1. A term used describe a desirable object.

v 2. A substitute for the word fuck, which derivates from the Dutch word, fokken.
Wow! This pie is fuff.

Man, you really fuffed it up this time
by Wyatt December 1, 2004
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When someone is almost buff but there's a layer of fat covering the muscle.
Girl: Damn, girl! That boy is fine!
Gay: Eh, I dunno, he's kind of fuff.
by aolhater73 June 30, 2009
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appreviated for fucked up for fun
"ayy nigga, LETS FUFF!"
by djlfkjsd January 12, 2009
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