I'm afraid the problem with language (especially slang) is, that if people keep using a phrase the "wrong" way enough, it will eventually become the "right" way. Languages evolve.
If someone uses a phrase in a sense that isn't in the dictionary, one could argue it is the dictionary that is at fault, since the purpose of the dictionary is to describe how the language is used, not to prescribe how it should be used.
An argument I often use during Scrabble.
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