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When a person hasn't seen or done something after a large amount of time has passed.
Holden hasn't seen his estranged father in donkey years.
by Babydoll75 February 26, 2019
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Many, long years; a long time spanning 2 or more years. Used when those years felt long.
Wow thats gonna take donkey years to finish
by Bri.P. October 18, 2010
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