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1.
a date that does not exist, used to emphasize that something will never happen.
"Alright dude, I'm gonna go to the concert, score a backstage pass, then bang Britney Spears in her dressing room."
"Hahaha cracka you must be kidding. That'll happen in Nineteen Ninety NEVER bitch!!!"
by Nick D April 05, 2003
 
2.
A phrase used when someone says something both outdated and unfunny, following "that is so."
'All your base are belong to us!'
'God, that is so nineteen-ninety-never. It wasn't even funny when it came out.'
by Care June 22, 2004