A mix of that's what she said and your mom.

Basically means the same thing as that's what she said, except you use your mom instead.
Bob: Damn, that was hard!
Joe: That's what your mom said!

Steve: I need a hard surface...
Jill: That's what your mom said!
by stellar angel kitty rawr x3 August 01, 2008
A clever combination of "that's what she said" and "your mom!". It was created to avoid the argument that "that's what she said" creates confusion because "she" is nobody while adding the punch of "your mom" jokes to it.

The phrase "last night" may be added to the end if extra pwnage is needed.
Person 1: "Whoa, that's a big hot dog"
Person 2: "That's what your mom said!"

Person 1: "Whoa, that's a big hot dog"
Person 2: "That's what your mom said last night!"
by Nikki Duff July 30, 2008

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