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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 13, 2006
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The worst insult possible in the entirety of the English language, ur mom gay, ur dad lesbian, and ur granny tranny dwarf in comparison.
1:ur mom gay

2:well ur dad lesbian

1:no u

2:well ur granny tranny

1:then ur grandpap a trap

2:well ur mother-in-law fucked ur papaw
1: *explodes into dust, immediately in hell*
by milkchocolate10291 March 14, 2018
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