Top Definition
One who has sexcual intercourse with ones own mother in law.
My wife has one sexy mother, so sexy in fact that I just had to fuck her. Afterwards I fucked my wife and compared the two.
Wasn't much in it, even their tits are alike, I guess I'm just one mean ass mother in law fucker!
by Slapp The Great May 02, 2006
5 Words related to Mother in law Fucker

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