There is no such thing as "would of."
The words are "would have" or "would’ve."
Just because it SOUNDS like "would of" when you say it, doesn’t mean you SPELL it like that.
Please make a note of it, because if I see you write "would of" anywhere, I will have to hunt you down and kill you.
Thank you.
Idle Eyes and a Dormy 
Are you saying that if I would of used it in a sentence you would come to St. Pete?
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I’m 100% with you here S/b – but (sorry to dampen your murderous mood) I’m pretty sure that I’ve seen this phrase in both Scott Fitzgerald and James Baldwin, amongst others. I think they’ve all been American authors so although reading it has pulled me up sharply, I started putting it down as being an ‘Americanism’. Now where’s Dr Spo when we need him?
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omfg that drives me NUTS!!!!
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Eventually it will make its way into the dictionary as an informal would have and should have. When it is included in the vernacular of so many people, its in inevitable.
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Would of been nice, if you had told me this earlier. Can I expect a visit now? Before you kill me, will you slap me around a bit first?
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Prolly sompin U cn git ovr.
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