look up any word, like ratchet:
 
1.
The act of having anal sex with a woman on the top of a staircase with her head facing down the stairs. As soon as the man climaxes, he pushes her hands out from under her and rides her down the stairs.
I was banging this hooker last night, and I totally gave her the purple donkey!
by HOW_SONAR September 10, 2010
 
2.
A magical creature that appears in your room when your high, takes your shit, and then runs out.
WTF, the Purple Donkey just came and took my sandwich, what an asshole!!!

The purple donkey is in my room and he's taking shit.
by Whazzit Tooya April 25, 2013