Contrary to how it might sound, taint checking has nothing to do with 'checking' the area between the scrote and the asshole and everything to do with computer science. It's an error-catching mechanism built into some programming languages (Perl and Ruby, primarily) designed to prevent user input from 'contaminating' other variables in a program.
The built-in taint checking kept that SQL injection attack from crippling our website.
by Erratum November 30, 2010

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