What is the origin of "your mother" as an answer to any question?

I'm just curious, as the term "your mom" as an annoying answer/reaction to any question/comment is also used in other languages. So what is its etymology?

UPDATE

I even found a reference on Serverfault.

Maybe it wasn't that clear what I meant, so I give two examples taken from the urban dictionary:

Guy 1: I'm going to tie my shoes

Guy 2: YO MOMA'S GONA TIE HER SHOES!!!

and

Girl 1: That Girl is a slut.

Random Guy 1: YO MOMA'S A SLUT!!!

I even remember an Episode from Miami Vice (season 3, maybe episode 22) where Crocked asks for the whereabouts of a suspect and he gets a kind of "Your Mom" as an answer.

Here's another reference:

Presumably people are generally assumed to be rather annoyed if the chastity of their mother is questioned?

Even the great rap-star Bill Shakespeare (from the West midlands massive) used it:

Demetrius: “Villain, what hast thou done?”
Aaron: “That which thou canst not undo.”
Chiron: “Thou hast undone our mother.”
Aaron: “Villain, I have done thy mother.”

Some people trace it to a centuries old African-American game of trading insults called "the dozens". https://secure.wikimedia.org/wikipedia/en/wiki/The_Dozens