wouldn't know

I wouldn't know ((anything) about that)

I have no knowledge or familiarity with what you are asking or discussing. Can be used glibly or sarcastically. A: "I absolutely love Barbados. It's one of the most beautiful places in the world!" B: "Hmm, I wouldn't know. I've never been able to afford a trip there." A: "I was wondering if you could help me. I need to fill out a form to have the deadline for my application extended." B: "I'm sorry, I wouldn't know anything about that." A: "Do you know how these drugs got here?" B: "No sir, officer, I wouldn't know about that."
See also: know
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

(I) wouldn't know.

There is no way that I would know the answer to that question. John: When will the flight from Miami get in? Jane: Sorry, I wouldn't know. Bob: Are there many fish in the Amazon River? Mary: Gee, I wouldn't know.
See also: know
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
See also:
References in classic literature ?
If he was crazy, he wouldn't know, and I wouldn't know his mind either, and I wouldn't be that one jump ahead of him, and he'd get me and mess the whole cage up with my insides."
Besides, the planter insisted that Roxy wouldn't know where she was, at first, and that by the time she found out she would already have been contented.
I set down again, a-shaking all over, and got out my pipe for a smoke; for the house was all as still as death now, and so the widow wouldn't know. Well, after a long time I heard the clock away off in the town go boom -- boom -- boom -- twelve licks; and all still again -- stiller than ever.
Jake was going to play deef and dumb here, so the neighbors wouldn't know his voice.
We wouldn't know one from the other, and one of our rival's might slip in."
As for the second, he's only half-witted, and if he was better off he wouldn't know it."
"And even if they did, they wouldn't know who it was and they's keep it mum for me.
`You wouldn't know the brick house, Sarah,' says Jane.
"Your own mother wouldn't know you like that--much less your sweetheart."
"Sometimes, toward the end, I could see three of him in the ring at once, an' I wouldn't know which to hit an' which to duck ...
"I wouldn't know how to reach the mainland myself, an' know that none o' the other fellows would, so's you're the only one that knows anything of navigation you're the fellow I'll tie to."
'You wouldn't know him if you saw him then, belike?' said Hugh with a malicious grin.
I kept asking myself, 'Now is this the sort of thing Katharine would like?' I always think of you when I'm writing, Katharine, even when it's the sort of thing you wouldn't know about.
"If he did speak, you wouldn't know what to say, but would cry or blush, or let him have his own way, instead of giving a good, decided no."
But, sure, you wouldn't know what that is, acushla, nor what it may mean to the likes of me.
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