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I know I'm forgetting something 

A gut feeling you get when you're about to leave to go somewhere. You know you're forgetting something essential to your trip/destination but can't immediately place your finger on it.

The feeling is strange and based mostly on intuition, similar to deja vu. If you get this feeling, you may be tempted to dismiss it as a delusion, but after a short period of time something will trigger your memory and you will remember what it is you forgot. To avoid any inconveniences, the best thing to do when you get this feeling is to run through a mental or physical checklist on what you have packed and what you haven't.

This notion made an appearance in the 1990 family movie, Home Alone, when the main character, Kevin, is forgotten at home by his parents on their Christmas vacation to France.
Joe: "You ready for this trip to Amsterdam?"
Brett: "Hell yes, the only problem is that I know I'm forgetting something, but I can't think of what it is."
Joe: "Oh, don't worry about it... you probably just forgot to feed the dog."
(3 hours later, when checking in at the airport)
Brett: "Shit! I forgot my passport!"
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You know I had to do it to em 

A meme originating from over-the-top flexing, usually in relation to ones outfit or style.
Hypebeast #1 - Bro, how you going to show up to graduation wearing a jean jacket, jean-shorts combo?

Hypebeast #2 - You know I had to do it to em.

Sexy and I Know It 

The most recent LMFAO music video. Focuses around the male ballsack in a speedo jiggling around and getting bitches. Great video. Also features pornstar king Ron Jeremy.
Red Foo: Hey did we finish "Sexy and I know iT"? i Was too tired from getting ass

I don't know if I need a shit or a haircut

Originally Northern Irish, this expression shows confusion. As in:
(1) I'm so drunk I don't know if I need a shit or a haircut!
(2) What the fuck are you talking about?! You don't know if you need a shit or a haircut!

Gregory, do you see that small vent on the floor? Have you heard Among Us, Gregory? You need to vent. I know it will be hard for you to be sus but I know you can do it Gregory. 

Freddy: Gregory, do you see that small vent on the floor? Have you heard Among Us, Gregory? You need to vent. I know it will be hard for you to be sus but I know you can do it Gregory.

I know I am but what are you? 

The opposite of the widely known, stupid comeback, This will usaully get your offendor to say something stupid about themselves.
Person 1: You suck eggs!

Person 2: I know I am but what are you?

Person 1: A dipwad.

Person 2: Exactly

you know I love ya 

A phrase said after you've massacred someone's pride.
"You really look hideous today"

"::Gasp::"

"But don't worry! You know I love ya!"