Noodle Knocking 

The act of shooting somebody in the head at close range.

"Ain't no driveby's done around here, we strait up noodle knocking man."

Noodle Knocking by cmescopen January 16, 2009

Knocking The Noodle 

1) Jerking off.
2) Cranking it.
3) Masturbating.

I'm gonna go home and knock the noodle.

Knocking The Noodle by Matthew Cox May 25, 2005