I'm coming in a tad late here, but here goes...

People who interject R's into normal words, ie: Warshington, warsh the winduhs, etc.

Woof instead of wolf.

Ain't...I use it occasionally, but only in one or two sayings I use to make a point.

Overuse of the F word, and overuse of the word "like". I'm so over it...

Any word that is slurred or mumbled....my 14 year old has suddenly lost the ability to speak clearly. The kid mumbles EVERY word that escapes his mouth. Drives me NUTS.

Mammiogram. It's MAMMOGRAM. sheesh....

I seen...I just don't know where people learn to talk.

Geeze can you tell I was raised by a British mother who taught me to enunciate precisely? (I don't always, but I still like clear, appropriate speech).

<climbin down off'n mah soapbox>