Jack Blade quote from Tropic Thunder. His character was experiencing withdrawl from cocaine and he was tied to a tree. Crazy shit ensued.

Basically, It means your mother sleeps with everyone and has deseases between her legs, and most likely, you are unwanted crotchspawn.
"Your mother is a cankerous whore!"
"Damn."
"Hey, remember that time I called your mother a cankerous whore? I didn't mean it man, she's a nice lady." - Tropic Thunder
by Allie-Rose March 12, 2009
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leave me in your mother

This expression probably originated from the Hebrew expression "swear in your mother!" which is used as an exclamation conveying disbelief or surprise.
What? You she was at the party too?! Swear in your mother!
by Oren Douek March 23, 2005
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word to your mother

i'm right and you're wrong.
"BOOYAH! word to your mother, son."
by ? April 30, 2003
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deadset my heart and soul, clean as a kiwi cranny-bum
choice bro,now that's as clean as your mother's reputation
by S & A May 18, 2007
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your mother is your brother

An epic comeback in any argument. Even more powerful than "your mom gay"
guy1: "ur mom gay lol xd"
guy2: "oh yeah? well your mother is your brother!"
guy1: *dies*
by wet_cardboard69 March 28, 2018
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Bonk your mother day

International bonk your mother day is where you get a stick, rolling pin or baseball bat and bonk you mother's knees.
Casey:“do you know what day it is today? ”
John:“no, why?”
Casey:“it's 'bonk your mother day'!”
John:“oh cool!”
by _Asher_ November 20, 2020
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