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1.
"your mom is your dad's mom" is a satirical reference to jokes beginning with "your mom is..."

it came from boredom while walking around target.

if someone is telling "your mom..." jokes, tell them this one, and you will win, for sure, i promise. they won't know what to say. guaranteed to work, everytime.
"your mom is so fat she......blah blah blah"

"your mom is your dad's mom"

"wtf?"

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*clicks the thumbs down thing*
"yeah? well...your mom is your dad's mom"
by i am soooooo saxy April 24, 2006

Words related to your mom is your dad's mom

ur mom your dad your mom your mom is your dads mom