Define I Knew That Meaning

I Knew That
When one feels ashamed of what they thought they knew.

Person A: wow it's so weird that we have 7 planets when we only live on 1.

Person B: um there's 8 planets O.o

Person A: oh yeah, I knew that :D
By Emylee
Pssht, I Knew That...
What you say so you won't look stupid in front of your crush, when you really did not know that.

Alisha asked what period they had next although this was the last period of the school day. She brushed it off with a, "Pssht, I knew that..." when her crush walked by.
By Otha
The Moment I Knew
A song about realizing that something or someone isn't going to work out or it will never be. The Moment I Knew is written and sang by Taylor Swift.
a.k.a. this song is my life

It was 2 am, I was waiting for you to come back to me and that was The Moment I Knew that we could never or would be ever together.
By Cathyleen
I Knew You'd Trade In 300
A phrase used to let others know they've traded sides, i.e. committed treason. This word developed from the blockbuster motion picture 300.

The acts of treason committed by the hunchback traitor Ephialtes stem from his rejection to join the Spartan Military. His morbid anger leads him to join sides with the Persians, thus trading sides in 300.

This phrase is highly adaptable in modern day sense. Whenever someone you see commits an act of treason, betrayal, or pure stupidity, respond hastily with "I knew you'd trade in 300."

Let's say you call Shotgun and Pit steals it from you anyway. You're too borderline blackout drunk to even want to argue with Pit. So, instead of arguing with him, you simply say..."I knew you'd trade in 300."
By Angelica
I Wish I Knew How To Quit You
1. Said by someone who has a very obvious unrequited gay crush on someone who remains oblivious to his flirtations. Usually said after doing the thousandth favor for him for free, despite massive actual personal cost.

A humorous reference to the epic line uttered by Jack Twist to Ennis del Mar (RIP Heath) in the film Brokeback Mountain.

Dude 1: Thanks for the coffee. You didn't have to walk through 600 km of hot dry desert, cross an ocean of razorblades, and defeat 10,000 dragons just to get me one.

Dude 2: Oh it was nothing. Anything for you. *stares longingly at Dude 1 as he sits down*

Dude 1: Why are you staring at me?

Dude 2: I wish I knew how to quit you...
By Pegeen
I Thought You Knew
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"
By Netti
I Thought You Knew
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!"
By Nevsa
I Thought You Knew
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!!
By Consolata
I Thought You Knew That
when somebody discovers something shocking about you, this is the perfect thing to say.

roomate: dude did u kiss a dude at that party last night?
me: yeah im bisexual i thought you knew that.

me: *snort* *snort* oh yeah this is the freakin stuff!
roomate: ALLAN are you snorting DRUGS? WTFs WRONG WITH YOU?
me: oh yeah i do cocaine i thought you knew that man.

me: hey dude
roomate: allan you're a sexually confused dope addict i want you OUTTA HERE ASAP!!
me: wtf i thought you understood me!
roomate: hmmm... yeah im a republican i thought you knew that *snicker snicker*!
me: FUCK YOU JACKASS!!!
By Linnet
OUT-BEFORE-I-KNEW-IT
1. When someone says an inuendo/or offensive term before they realise.....
2. Being naive
3. A sexual reference
4. Saying before you speak...

"That Holli is as big as a house! uh oh that was out-before-I-knew-it....and so was she..."
By Marjie