Something your family can’t do before they enter your room
*mother barges in bedroom whilst you’re in the middle of having sex*
You:”Holy shit mum, every heard of knocking
by elv14 October 27, 2020
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Punching a Door until it opens
* Invention of Knocking *:

"I'LL PUNCH YOUR DOOR UNTIL YOU OPEN!"
Person: * Opens * Greetings!
by 7Macros February 22, 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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Having sex with.

A contraction of "Knocking the back out of"
Hey, did you know Bruce is knocking Sarah?
by ryan March 24, 2004
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Punching someone's door very softly until you get their attention
I heard knocking on the door and I noticed that it was a package.
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