"That's what she said" or if they have a hot mom "Thats what your mom said last night"
Two good examples from today.
Friend: "Wow Erik, that was amazzzing" (sarcastically)
Me: "That's what she said"

Friend: "It's not that hard" (math problem)
Me: "That's what she said"
A good one versus rival soccer team
Opponent yelling to his team: "KEEP IT IN!" (as in the ball)
Me: "That's what she said"
Two good examples from today.
Friend: "Wow Erik, that was amazzzing" (sarcastically)
Me: "That's what she said"
Friend: "It's not that hard" (math problem)
Me: "That's what she said"
A good one versus rival soccer team
Opponent yelling to his team: "KEEP IT IN!" (as in the ball)
Me: "That's what she said"