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1.
Swallowing semen at the end of a blow job.

The term originated on the LOGO Show, Rick & Steve.
Here's the official story of the Michigan Mop Job. Originally the line was "Plus I'll swallow because I don't have anything to lose." But Standards & Practices wouldn't approve it to air. In fact, they wouldn't allow ANY known euphemism for a sex act involving semen eating .

So I had to come up with a fake sex act that didn't mean anything. And that was actually tougher than you'd think. It seemed every word actually meant something: seattle sock job, blowfishing, cottage cheesing, california car wash... it was all taken. Finally I went with Chuck's moustache for the inspiration of a "mop job" and added Michigan to make it sound nastier, and it didn't show up in Google, so it was safe.

In short it's not actual act, but if it were, it would probably involve a moustache and eating ejaculate.
Source(s):
http://community.happiestgaycouple.com/0...
by IndyQueer February 27, 2009
 
2.
1. A blowjob from someone with a mustache who subsequently swallows the ejaculate.
2. When a mustachioed person ejaculates on someone and then eats the cum off.
I'm the only one who's willing to give you a Michigan mop job.
by yrmenlaf January 02, 2009
 
3.
Indeterminate thing that the character Chuck from "Rick and Steve" is willing to do only because he has AIDS. Most likely it has nothing to do with a mop but may involve a moustache.
"I can do a Michigan Mop Job, because I have nothing to lose."
by Doctor Suppan August 24, 2007