What is I Thought You Knew?
1.
When someone does something sneaky or stupid, then when they are caught say "I thought you knew." aka "I didn't think you needed to know"
Your girlfriend cheats on you with some guy, then weeks later says "I thought you knew"
2.
heard in pockets of the southern US: an affirmation; agreement; inferrance of common knowledge... usually accompanied with a hair toss, whether or not there is hair to actually toss... expletives can be added to show emphasis or anger
"Everyone here wants to do you, Angie"
"I thought you knew, honey!"
"Donita knows not to mess wit yo man since you pulled her wig off and smacked her with yo heel!!"
"Thought you muthafuckin-GOTdamn knew!"
3.
when someone who is usually a smart ass asks you a question you reply by saying "i thought you knew"
tere: where is the meeting at?
greg: i thought you knew!!
