docking is the act of putting something in your urethra. In layman's term, its the act of shoving a dildo up your penis hole. a ninja docker is some one who puts their penis up another penis so fast that the other person doesnt even feel it or know what just happened.
guy 1: i'm not sure what just happened but wow does my penis feel awesome.
guy 2: dude you just got ninjadocked
or
look at that dude he is such a ninja docker
A docker diver is someone who cannot keep their hands out of the ashtray and is constantly searching for another docker-fresh hit.
"That dude with the afro is such a docker diver, i saw him smoke 3 dockers in a row the other day"
an android phone abuser/developer
someone: my phone stuck on android 9
dockerized: let me help