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I know what THAT means 

A verbal prank commonly used by in a conversation, with the intent of annoying the listener. In this prank, there are two parties having a conversation: person A (the pranked) and person B (the pranker). Person A makes a simple, innocent remark with no double meanings. Person B initiates the prank and replies, "I know what THAT means" (note the emphasis on the word "that").

The prank is that person A begins to feel insecure or uncomfortable about what they have said, because the phrase, "I know what THAT means" gives the impression that person B misunderstood what was said (i.e. thinks it has a sexual meaning, or thinks they're lying about something). Person A is completely unaware that person B is just trying to annoy them.

After this, person B could proceed to only say, "I know what THAT means."
Dwight (person A): Hey man, I just remembered, that new Eminem album is out today! Wanna go get it?
Jim (person B): I know what THAT means...
Dwight: Um, what do you...think it means?
Jim: I know what THAT means...
Dwight: **quizzical look on face** um, all I asked was, wanna get the new Eminem album...?
Jim: I know what THAT means...
Dwight: **getting kind of annoyed** do you wanna get the new Eminem album or not?
Jim: I know what THAT means...
Dwight: **more annoyed** what does it mean?! Eminem album or not?
Jim: I know what THAT me--
Dwight: **angry** WHAT? WHAT?!
Jim: I know wh--
Dwight: WHAT DOES IT MEAN??!! WHAT??!!

I don't even know what that means 

This phrase is tagged to the end of one's speech in order to reveal an innuendo or undertone. It is expressed with a wide-eyed expression and a tone of confusion. It is often synonymous with "That's what she said".

Unlike "That's what she said", it is proper for one to add this phrase to the end of his/her own speech, as well as for others to do the honor for him/her.
Scott: "This female's pelvis has been articulated... I don't even know what that means"

Do you know what that means? 

Something said when something obvious is implied.
Bob: I dont have to go to work today.
Dave: Do you know what that means?
Bob: What?
Dave: Minecraft time obviously.

I don't know what that means 

A common response that happens when an asker made a point
but the receiving end felt offended and looked down on the question.
Then quipped by the receiving end!
A: Hey any tips on how to make money?

B: I don't know what that means.

You know what that means, FISH 

This is what you say when you are or become a retard. or it is a dumb joke.
You me, gas station. what are we getting for dinner? sushi of course! uh oh there was a ruffe in our gas station sushi. we blackout and wake up in a sewer, we're surrounded by fish. horny fish. You know what that means, FISH orgy. the stench drives in a bear, what do we do? we're gonna fight it. bear fight, bear handed, bear naked? oh yes please. we befriend the bear after we beat it in a brawl. then we ride it into a chucky cheese. dance, dance revolution. revolution? overthrow the government, uuuh I think so. next thing you know, I'm reincarnated as Jesus Christ, then I turn into a jet, fly into the sun, blackout again, wake up, do a bump, white out which I didn't know you could do. then I smoked a joint, greened out, then I turned into the sun, uh oh looks like the meth is kicking in, uuubgghhhugghhuuaaahhhhaahhhhAAAHHHHHHHH!!!!!

you know what that means 

when you're just there minding your own business and then you hear the following words:
"You know what that means"
FISH.

Origin: YOU, ME, GAS STATION on YouTube
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proper lad 

a lad that is such a lad that he is a proper lad
person1:did you see bob
person2: ya he was a proper lad
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A vacation, feeling more like an obligation, that involves visiting or staying with family.
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Surf Dracula Syndrome 

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