Donkay means many things.
Originally it was an
expression of excitement, as in, you are in an airport
on your way to a hedonistic Hawaiian vacation and you exclaim, "Donkay!!"
Oddly, it morphed into meaning, "penis" and then started being used to describe the sex act, even the vagina. It morphed again as a term of endearment, "Hey donkay girl"- it can even be used as a salutation, as in "donkay" (initial text to someone)- that person might respond with, "Donkay!" or something entirely different like, "what are you up to?"
Again, "Donkay" means many things.
"
I hope your new BF has a big donkay!"
"Did you let him get to
third base and touch your donkay?"
"It's certainly not very lady-like to get donkay'd on your
first date!
"Donkay girl! long time no talk to!"