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1.Most foul, devious, manipulative, evil, premeditated, fake, smile in your face while stabbing you in the back, worst plague God has ever sent upon us...especially me.

2. The beast who bore my husband.

3. Root of all evil. Angel of Death
I would rather suck on exhaust fumes than live with my mother in law.
by Anra September 26, 2005
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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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She who spawned the screaming banshee from hell. Oops, sorry. That would be X-mother-in-law.
...the slime oozed from the festering pustules on my x-mother-in-law's face.
by free-at-last. September 23, 2003
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Fake Mother In Law

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A Fake Mother In Law is a person who for the sake of her relationship with her son or daughter, is a hypocrite with her daughter or son in law in all situations. This person will gossip and talk behind your back but in-front of her child is a saint.
She is such a Fake Mother In Law! I would never talk to her if it wasn't for my hubby.
by AndyMiami May 30, 2007
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When a person's lips grant a facial expression of sadness when at rest or even when expressing joy. The lips fail to reach a horizontal orientation even when the person is attempting to smile.
Husband: Your mother looks looks so pissed off right now.

Wife: Nope, she is smiling.
Husband: Yeah, but she has a huge frown; it looks like an upside down U, like the old dude in Up.
Wife: Oh, that's because hse has the mother-in-law's contracture.
by MILFwithMILcontracture January 11, 2011
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