look up any word, like donkey punch:
 
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
 
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
 
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