To Grab Somebodies attention...slang for pay attention
Knock Knock mothafucka when you see me on da block
by Dustin407 June 4, 2007
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A general phrase describing anything, in any situation... originated from "knock knock messenger."
1) Man, that's just... "knock knock."
2) Fucking knock knockin' bullshit!
3) That's one knock knock hat.
by gesis September 18, 2003
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When a girl releases dirty videos or photos of you to Facebook or any social media for all your family and friends to see.
(Don't be a horn dog or a fuck boy and this wont happen to you)
Person1- Dude this chick is fucking releasing dirty videos of me on Facebook.
Person2- LOL omg dude, do you know what your getting.
person1- No what am i getting.
Person2- Your getting Knock Knocked , welp you better start finding new friends.
by Negan3932 July 9, 2017
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A joke made about a caller at the door. It usually ends up as a play on words.

The structure of a knock-knock joke is as follows:

Person 1: Knock-knock.

Person 2: Who's there?

Person 1: (Phrase A).

Person 2: '(Phrase A)' who?

Person 1: (Phrase A) (funny punch line).
Here is a knock-knock joke:

George: Knock-knock.

Reginald: Who's there?

George: Em.

Reginald: 'Em' who?

George: Emphysema! So you better quit smoking!
by Diggity Monkeez May 19, 2005
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A prank typically played by children where the prankster knocks on the victim's door or rings their doorbell and runs away thus leaving the victim with no one at their door.
Also the name of an indie pop band based in Waterloo, Ontario who have been together since 2004 and have released two self-produced EPs entitled Hurry! (2005) and Based on a True Story (2006). They have performed at mostly small venues around Southern Ontario and have played the University of Waterloo's Canada Day festival and the Halifax Pop Explosion. There is currently a full length LP in the works right now.
Hey, let's go play knock knock ginger on that kid's house!
by SJL1138 September 11, 2007
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A game played by 8-14 year olds whereby you knock on someone's door, run and hide. It's funnier if you pick the same house a few times and tempt fate. This term is used in Western Canada, particularly the prairies. Same game as Nicky Nicky Nine Doors (Eastern Canada), and Knock Down Ginger
Let's play knock knock ginger on the teacher's house.
by Al68 July 31, 2005
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What people post on Twitter when they possibly just swatted someone.
@poodlecorp #knock #knock
by Mattdude July 19, 2016
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