1) A group of jokes meant to criticize one's mother by saying that she is fat, ugly, stupid, etc.

2) A lame phrase someone I know keeps saying whenever I ask him a question about PE because he has it before me.
1) Yo mama so ugly people watch her during horror movies.

2) Me: Hey, what are we doing in Pe today?

Him: Yo Mama!

Me: Shut the f up.
by army_azn December 09, 2004

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A brand of outdated jokes that are still told by ignorant fucktards. Anyone found telling these jokes are to be immediately dazed by pepper spray, assfucked by a homeless bum, and fight Chuck Norris to the death.
Yo mama is so fat, when she stepped on a scale, her acceleration from rest resulted in a force between the two conductors of 6.0 to bi-tensor com-flex 23 newtons-per-minute and the magnetic flex around the closed curve was proportional to the algebraic sum of electric currents flowing through that closed curve.
by ServiceWithaSmile March 21, 2009

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as in yo mama not mine so back the fuck up!!
yo mamas so small she plays tennis against the curb!
yo mama is like a contoller you press her buttons and play her w/ yo joystick.
yo mamas like a slot machine the more you pay the more you play!
by nerf-herder5000 August 06, 2007

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a remark meant to be derrogatory, but only comes out as being incredibly asinine.
"yo mama so big when she sits around the house, she sits AROUND the house!"

person 1-"what are we doing tonight?"
person 2-"yo mama"

by HEEBIES March 16, 2006

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way for those of us with an IQ under 60 to make a joke
(good one)
your mama is so fat that she has 2 birth days her's and earth day

(decent one)
your mama so fat when she was a lizard for halloween ever one thougt it was godzilla

(really bad one)
your mama so stupid....uh.......she......sniffs the dog
by chopmasteronion2 August 18, 2005

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a word that a person uses to insult another persons mother
micheal had just pissed in the park
jack says,"i know that was what yo mama teach you,".
by hazwan January 31, 2004

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yo mama
yo mama iz so fat, she haz got more rolls than a supermarket!!!
by youtalkintome? November 07, 2003

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your mama is so fat when see sat on the rainbow skittles came out
yo mama is so cute heyyyyyy
by dervayja fullmore May 03, 2007

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