Top Definition
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 knock on wood when no real wood is around, especially when posting a message online or using an instant messenger.
"I have never gotten the blue screen of death. (knock on computer screen)"
by BraceDecade June 18, 2009
6 Words related to Knock on Computer Screen

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