Yo momma so stupid when she went to Subway, she asked for a ticket to Chicago. 
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Fly like a butterfly sting like a bee I slept with yo mama now it burns when I pee.
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Yo mamma so stupid she stopped at a stop sign and waited for it to turn green.
Yo momma so stupid, she took a spoon to the Super Bowl.
Yo mama is so skinny that she eats a nut and thoughts that she’s pregnant...
Your mom's so dumb, she threw the dog and told the stick to fetch!
Yo mama is so fat, the recursive function computing her mass causes a stack overflow.
Yo mama so stupid she told a yo mama joke to you.
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Yo' Mama is so stupid, she invented a ventilated condom.