an insult or a threat that one tells to someone else. once the person who replies with "who's there?" the ejoke abruptly ends with the answer "fuck off" many opther endings can be used to make this insult more interesting or more focused on the insultee.
"hey, knock knock"
"who's there?"
"fuck off!!!"

"hey knock knock"
"who's there"
"a fuckin dick thats about to get their ass kicked"
by Ratbiker May 24, 2007
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When someone knocks and then opens the door, defeating the whole purpose of knocking first.
Guy: Dude, my mom tries to justify her barging in saying she knocked, but all she did was knock in. One of these days she's gonna catch me.
by TheMagicalHobo August 3, 2008
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Nyc slang for guns/weapons
“ I Hate Sittin In Cars When Ion Got The Knocks
by GomdBozo December 16, 2021
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Something that occurs when combustion of some of the air/fuel mixture in the cylinder does not result from propagation of the flame front ignited by the spark plug, but one or more pockets of air/fuel mixture explode outside the envelope of the normal combustion front.
Modern cars are prone to low-speed knocking
by Sir. B October 24, 2020
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when you just don't care what the hell some one is saying.
Deminstrate this by knocking on an object twice and saying knock knock.
" Knock, Knock"
" Whos there?"
" I don't care"
by vicky March 6, 2005
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The Knock - when someone knocks on your door to bust you, serve a warrant, or otherwise ruin your day.

Could be in an apartment when the super knocks on your door because you’ve had a friend staying over too long. Could be in a hotel when you haven’t checked out and they’re telling you you’re late and it’s time to leave. Could be in a dorm when you’re having a party and you get busted by the RA. Or could be when the police show up because you’re in deep shit. Probation officer, serving a warrant, anything. It’s bad news.

The knock is from someone in a position of authority, hitting your door to tell you you’re in trouble. You don’t have a choice to open the door or not. The only question is how bad the trouble is going to be.
Oh shit, he got the knock.

I got the knock this morning, I’m out boys, getting evicted as we speak.

Remove me from the group chat, I’m worried about getting the knock after one of you idiots says something that triggers the feds
by Nobødy January 17, 2021
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