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If you've been linked to this, you probably made a language mistake and whoever sent this to you cared enough to point it out. The best thing to do is read the details and see where you went wrong.
Often this is used in the phrase "that big of a deal". However, this is not grammatically correct. (The prepositional phrase seems to modify "that big", but that is an adjective without a noun, which is not allowed in English.)
The correct usage removes "of": "that big a deal". You can see how it is correct by reversing the order: "a deal that big".
Note that "of" is still correct in "a bit of a deal", since "bit" is a noun, not an adjective.
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