The improper use of "their", "there" and "they're." Also "your" and "you're." I have also seen a rise in people using "then" when they meant to use "than." As in "SRD has Dovo's cheaper then anywhere else."

I also cringe at the overuse of words such as the one that started this topic.

Epic, sick, rad, tight, hot, killer, awesome.

"Dude, my paycheck was epic, time to go shopping for some sick clothes, in my rad car. The scene at the mall is going to be tight, after the mall we'll go to that killer bar and do some shots of Grey Goose. It'll be awesome."

I also have to work with a couple guys who always say "pacific" when they mean "specific" as well as referring to the new fiscal year as the "physical" year.

Finally, anyone who says booyah around me gets an instant punch to the throat.