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2.
A term derived from the longer "fit as fuck".

It is favoured over the rather vulgar buff, by the more educated inhabitants of South-East London to describe a female of stunning appearance.
"Mole girl is fit as"
by morgangills November 15, 2004
 
1.
a word most often used by people from the UK the english tend to use the word fit in place of the word hot it is the same with words like well fit
hey i saw you the other day your fit as (well fit)
by Ariel Riley September 09, 2005
 
3.
Pronounced feet-as. Something or someone desirable, or just downright amazing. Anyone who uses the word becomes fitas themselves, automatically.
Did you just see those two dance? Fitas!
by waltos10 December 20, 2011