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If this van's a-rockin', don't come a-knockin'! 

A popular phrase and bumper sticker from 1970s. It means that people are having sex in the van if it's rocking and they don't want you to come in.
Bumper Sticker: If this van's a-rockin', don't come a-knockin'!
Van: *rocks back and forth*
Steve: I guess I shouldn't be knockin'.

knockin' on heavens door 

(v.) To be undergoing spiritual enlightenment before ones death.
Mama put my gun to the ground, I can't shoot them anymore...

knockin' 

The act of trying to convince a prostitute that you would be a better pimp for her than her current pimp. Succesful knockin' is called being "knocked" or being "knocked' out".
I see a lot of new Ho's here tonight, time to start knockin'.
knockin' by DJCHRIS73 February 28, 2008

nigga knockin' 

person1: I'm bored
person2: It's so boring, there's nothing to do.
person1: I know, let's go nigga knockin'
person1: hahahaha, okay

*person1 and person2 walk up to a house, knock on the door, and run before anyone has a chance to answer it*

*person1 and person2 repeat the above process until they hit the wrong house and a big fast dude comes running out and gives them a stomp johnson*
nigga knockin' by Douglas Teel November 25, 2007

Knockin' Noggins

When one or males make contact with the heads of their penises. Can often be played as a game similar to jousting.
Hey man, as long as we have our pants off... We might as well be Knockin' Noggins.
Knockin' Noggins by donhonk December 11, 2010

Knockin' nuts 

The slapping of the scrotem on ones inner thighs.
Do you have a bag case of knockin' nuts?
Knockin' nuts by Chris&Annee February 17, 2021