you could've fooled meINFORMAL
This page is about the conversational phrase you could've fooled me
You can say this if you don't believe or accept what someone has just told you.
- "I study really hard, Dad."
"You could've fooled me! Every time I go into your room, you're playing computer games."
- "I never waste money, darling. You know that."
"You could've fooled me! Six hundred dollars for a pair of shoes?"
I said, "I love books," and Ruby said, "You could've fooled me!
Contributor: Matt Errey