look up any word, like hipster:
 
1.
A sex act that is performed by first anal penetration and then oral sex on the penis of the "active" part. Also known as simply "ass-to-mouth" or AtM.

While no one knows where it originated, it carries the name of Motor City, also known as Detroit. Perhaps named as political commentary or a comment or the local cuisine.
"You come over here, stud, and I'll give you a Motor City Special."
by bornabroad January 15, 2012