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Several decades.
World war Two was donkey's years ago.
av Kung-Fu Jesus 2 maj 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.
av possum_sue 20 april 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!"
av AnnaOhhhh 14 september 2009