Taint
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"Taint" is a term with multiple meanings.
The most common meaning refers to corruption or spoilage, for instance of a foodstuff by bacteria or fungus. This is used as both a noun and a verb.
Usage in computer science, particular in the Perl programming language, has derived from this meaning. In this usage, 'tainted' data is considered untrusted and treated with caution.
In more recent usage in US English sexual slang, it is a taboo noun referring to the perineum.
See Also
Wiktionary: taint (http://en.wiktionary.org/wiki/Taint)