Several decades.
World war Two was donkey's years ago.
by Kung-Fu Jesus May 02, 2004
A really long time.
1. oh, I've known her for donkey's years.

2. I've worked her donkey's years and I still don't know how to use the photocopier.
by possum_sue April 20, 2008
Sometimes referred to as Donkey Years or Donkey's Ears. It means a really really long time.
"I haven't seen Johnny in Donkey's Years"

"Wow it's been Donkey Years since the last time I ate pop tarts!"
by AnnaOhhhh September 14, 2009

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