The word that isn't a word

Do you use irregardless to mean regardless?

Trouble is, regardless already means something isn't worth regard, so adding the "ir" to it means... it's worth regarding again? Who knows.

"This is one of those words used almost exclusively by people trying to sound smarter than they are," Tim Cameron writes.

Dictionary.com, using the Random House Dictionary, notes:

Irregardless is considered nonstandard because of the two negative elements ir-  and -less.  It was probably formed on the analogy of such words as irrespective, irrelevant,  and irreparable.  Those who use it, including on occasion educated speakers, may do so from a desire to add emphasis. Irregardless  first appeared in the early 20th century and was perhaps popularized by its use in a comic radio program of the 1930s.

Wikipedia digs deeper:

The origin of irregardless is not known for certain, but the speculation among references is that it may be a blend, or portmanteau word, of irrespective and regardless, both of which are commonly accepted standard English words. By blending these words, an illogical word is created. Another possibility is that when people say "irregardless" they are following the pattern of words like "irrelevant", "irrational" and "irregular". "Since the prefix ir- means 'not' (as it does with irrespective), and the suffix -less means 'without,' irregardless is a double negative." According to the Oxford English Dictionary, Irregardless was first acknowledged in 1912 by the Wentworth American Dialect Dictionary as originating from western Indiana. Barely a decade later, the usage dispute over irregardless was such that, in 1923, Literary Digest published an article titled "Is There Such a Word as Irregardless in the English Language?"

So there.