What is Knock On Computer Screen?
1.
1.) A saying/action you bring up when something is almost done loading on your old-as-time-itself computer and you don't want anything to screw up.
2.) A substitute for 
"I have never gotten the blue screen of death. (knock on computer screen)"
See 
Random Words:
1. 
lolly gagger; one who lolly gags around; slakckers
Some one would be yalling at you so they would call you an eferterfanmurf.
" Y..