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1: Contraction of the words 'why' and 'not'.

2: Contraction of the words 'why' and 'isn't'
"Whyn't just go to the mall?"
by Do I Know You December 08, 2003
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2
A conjunction of why and not. Couldn't, shouldn't, wouldn't, whyn't whyn't? It's a logical conjunction!
"I didn't go to the movies with Jake last night."
"Whyn't?"
by o0DERPINA0o June 19, 2013
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3
whyn't. (US, dialectal) Contraction of why don't. (US, dialectal) Contraction of why didn't.
Hey Why'nt You FUC**** get my stuff?
via giphy
by Mind Exploder March 14, 2018
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4
A contradiction of "why + not".
Dad: You shouldn't see that movie.
Kid: Why'nt daddy?
by Stib's EVIIIL Dictionary September 08, 2016
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