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When someone is considered to be a slag. The higher the intensity of the slag-ish-ness the larger the number at the end of the phrase.
Girl 1: "Ohmygod have you seen that Chelsea, she's a bit of a one?"

Girl 2: "Naa mate, she's at least a 3"
by SexyMumma6227487 February 19, 2009
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A chancer. Someone who pushes the limit of what is acceptable and treads that fine line.
Did you see Tony at the market last weekend? He was flogging hooky DVDs and Blu-Rays.
Yep, he's a bit of a one, that Tony.
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by Maxx-B March 28, 2020
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