A shrewsburyism used in place of Do Not or Don't
Rob: Hey Jo wanna come to the pub?

Jo: Nah I dunna wanna
by Robert Leigh Adams December 01, 2006
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The shortened version of “don’t know”.
“Who says it like that?”

“I dunna. It’s probably a Midwest thing.”
by Evan F’er March 07, 2019
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Of Scottish derivation: means 'don't know'
'What time is the rugby match on?'
'Ach mate, I dunnae'
by whiskymack February 21, 2004
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