solecism / sol-uh-siz-uhm
1. a nonstandard or ungrammatical usage.
2. a breach of good manners or etiquette.
3. any error, impropriety, or inconsistency.
Example: The heated debate started cooling down as Lara cinched her argument. After Lara articulated her next point, Mike was at a loss for words. In desperation, he cried out this solecism: "That's irregardless!" With that, Lara knew she had won.
Origin: 1570–80; < L soloecismus < Gk soloikismós, equiv. to sóloik(os) (Sólo(i) a city in Cilicia where a corrupt form of Attic Greek was spoken + -ikos -ic) + -ismos -ism
* Hopefully my example works; I just wanted to talk about my intense dislike for the word(?) 'irregardless.' :P