Mistakenly only thought to refer to Geordie lingo, but has been used by MackemsSunderland for just as long but in a slightly different context.
Imagine the most extreme possible sarcastic meaning of the phrase 'As if' and 'Of course' but with even more negation of authority, then you might touch the full extent of it's meaning.
1)Diplomat-"The war in Iraq was not motivated by oil."
North east England inhabitant-"Why Aye!"

2)"It is possible to find an uncorrupt politician"

North east England inhabitant-"Why Aye!"
by Why Aye February 19, 2005
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NORTH EAST term of saying yes enthusiasticly, or no way.

Not just Geordies...
YES:
guy 1: Wanna pack a chips, like?
guy 2: Why aye!

NO WAY:

guy 1: Ya fathas just died, ya knaw..
guy 2: Why aye
by Dericjk January 4, 2004
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Geordie way of enthusiastically saying yes! Everyone is "man" even if you identify as a penguin! the why eye is like a "well duh obviously" way of saying yes!
ya Ganninn doon toon the neet?

Why aye man course!
by Charlxxe January 4, 2020
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