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2.
Having sex with.

A contraction of "Knocking the back out of"
Hey, did you know Bruce is knocking Sarah?
by ryan March 24, 2004
 
1.
talking down, disrespecting, degrating in a nice way
I aint knocking your lexus but my caddy will smoke ya..

or

your shoes are gay, i aint knocking ya you know what im saying, but the ladies ain't gonna come holla with them thangs..
by Brian September 13, 2004
 
3.
Sending someone a video request thru Knocking Live Video on your mobile phone.
I'm Knocking on your phone! Please answer!
by The World Is Knocking May 13, 2010