I came across this on an episode of Gilmore Girls (2.16 - There's the Rub), where Emily Gilmore says "I can't believe you let me get sixty-fortied!" (60-40d)
I can't find much reference to this online, just this one.
The episode transcript earlier explains
LORELAI: This isn’t a singles bar, Mom. It’s a sixty-forty bar.
EMILY: A what?
LORELAI: Sixty-year-old men hitting on forty-year-old women, divorcees mostly.
When later the expression you mentioned comes up it refers to that:
EMILY: Yes, by sitting me at a bar where you practically forced me to engage in inappropriate behavior.
EMILY: You let me get sixty-fortied!
As Silenius describes in the comments this is a form of transforming another class of words to a verb - or verbing / verbification. Therefore using the numbers as a verb by putting them in the right context and adding a verb ending.