"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?"
----------
*clicks the thumbs down thing*
"yeah? well...your mom is
your dad's mom"