" donkey's years "

 [ "donkey's years" ]

1: A really long time.

  * e.g.,  ...  oh, I've known her for donkey's years.  

 [ "Donkey Years" ]

1: When a person hasn't seen or done something after a large amount of time has passed.

  * e.g.,  ... Holden hasn't seen his estranged father in donkey years. 

 [ "Donkey's Years" ]

1: Used to describe a very long passing of time.

  * e.g.,  ... I haven't seen Melvin in Donkey's Years! Not even sure I'd recognize him if he walked up to me. 

 [ "Donkey's years" ]

1: Several decades.

  * e.g.,  ... World war Two was donkey's years ago. 

 [ "Donkey's Years" ]

1: Sometimes referred to as Donkey Years or Donkey's Ears. It means a really really long time.

  * e.g.,  ... "I haven't seen Johnny in Donkey's Years" "Wow it's been Donkey Years since the last time I ate pop tarts!" 

 [ "donkey years" ]

1: Many, long years; a long time spanning 2 or more years. Used when those years felt long.

  * e.g.,  ... Wow thats gonna take donkey years to finish