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1.
Its origin is of no importance only its destiny. It is the clean way of calling someone a motherfucker, cleanly.
You're such a mother father.
by MexicanShortie January 10, 2005
 
2.
It's how you say "motherfucker" when there's virgin ears around.
I can't wait to get my hands on that motherff...ather!

Motherfather, that hurt!
by Chris MF P May 11, 2008
 
3.
An explicative that implies that it's denotee is both a mother and a father; which is at this point a medical impossibility. It is also used idomatically because of it's close relation to the word mothafucka. The word has gained much popularity in conjuntion with the latter: chinese dentist.
Kimberly: Would you help me with the clasp of this necklace? Oww! you just pinched me you mother father.

or

Stuart:This boat detailing job is getting to be a real drag.

Monty: Sure as shit is. Let's ditch these rich ass mother father chinese dentists and go rollerblading or something.
by standardApartmentComplex March 08, 2009
 
4.
Clean way of saying "motherfucker"
Usage in amongst K-pop fans most likely stems from entertainer Boom who used the phrase on episode 3 of 2PM's Idol Army.
Cast thought he said "motherfucker" in poor English and he stated he said "omma appa" and not a bad word.
You mother father!
by keunilna April 13, 2013
 
5.
a clean way of saying "mother fucker." just like a gangster, i suppose.
brian: ey, you wanna come over tonight?
jane: you sleeping alone tonight mother father

andrea: ooh myyyyy
chris: oh goddd
andrea: mother father
by oneezy December 18, 2007
 
6.
An overly complex way of referring to one's Grandfather.
Yo, look at dat mother father, dawg!
by Logiko July 17, 2006