Originally Posted by Z Stig

Since MAZOC (apparently in your eyes) has now become a literary editing organization:
"Irregardless" is a word commonly used in place of regardless or irrespective, which has caused controversy since the early twentieth century, though the word appeared in print as early as 1795. [1] Most dictionaries list it as "nonstandard" or "incorrect". Also, the "Ir" and "less" seem to make it a double negative, ultimately meaning "regard". Microsoft word even puts a red squiggly line under irregarless and suggests "regardless".