Irregardless

A double negative that while technically a word, is nearly always being incorrectly used instead of regardless. The people using this are usually pompous assholes who usually double down on irregardless being the correct word to use and are usually using it at the end of an email to be a passive aggressive shitheel.

Debbie: “Irregardless of what was said during that meeting I still need you to send me an up to date TPS report.”
John: “The correct word is regardless, and you can shove that TPS report up your ass.”