1) n. When things are not what they seem.
2) When things seem to point towards another dude being a genuine motherfucker but he actually isn't.

Origin: In the film Horrible Bosses with Colin Farrell and Jennifer Aniston, Motherfucker Jones is the murder consultant.
Dude 1: When I was a kid I snuck into my mother's bedroom.
Dude 2: Uh-oh!
Dude 1: She was laying there, naked.
Dude 2: Dude.
Dude 1: She'd been drinking all night.
Dude 2: We get it.
Dude 1: And I snuck up behind her.
Dude 2: Aah!
Dude 1: And I slipped my fingers...into her purse.
Dude 2: Purse. You said purse! Motherfucker Jones !
by Dean Motherfucker Jones October 5, 2011
Get the Motherfucker Jones mug.
When someone is stereotyped, but then breaks the mold
Businessman: *looking at him like he doesn't have money because he is black* Sir, we are going to have a large upfront cash investment....
Motherfucker Jones: *drops sack of cash on table* I'll take 3

Dude 1: Yeah, I don't have the money to pay you
Dude 2: I'll take that watch, then
Dude 1: Motherfucker Jones!
by theartistformerlyknownasyang February 17, 2015
Get the Motherfucker Jones mug.