To describe somethins as 'xyz as a butchers' means 'very xyz'. Orig. from the TV advert for Butchers dog food, with the catchphrase 'Is your dog as fit as a butchers dog?'. Hence, to describe a girl as fit as a butchers , or fit as a butchers dog means she is very fit.
Paris Hilton is fit as a butchers. (meaning she is very fit)
It's hot as a butchers. (meaning it is very hot)
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