Wiktionary
n. (context idiomatic US colloquial English) A very long time.
Usage examples of "coon's age".
Used to have a lot of possum, but we ain't had one of them for a coon's age now.
It was a coon's age before they ever amounted to anything, and even then they were still shockingly grasping and paranoid.
It was the first night I'd spent in a bunk in a coon's age, and I wasn't too pleased.
Even Nolan, who was my twin brother, I'd not seen in a coon's age.
She had black curly hair and big innercent gray eyes, and she was the purtiest gal I'd saw in a coon's age.
We Sacketts, along with other hill folks from Kentucky or Tennessee, been floating rafts of logs downstream for a coon's age, but the places I knew best weren't likely to be on Orrin's callin' list.
I can swear on Grandpappy Hank's Bible that not one tiny thing has happened to me--or anyone else I know--in a coon's age.
We both agree that the hospital's out, and the welfare office hasn't sent anyone to Robin's cabin in a coon's age.