oh yes... 'my bad' annoys me big style.
Thankfully i only ever hear it on US tv programmes, which i dont watch very often, but... UGH!!!
When did people start saying this, and more importantly, when will it STOP?!
HIGHLY agree... ALL my 'bad' students like to say it, and I've had to find a way not to show my annoyance, else they do it more.
What's really irritating is they say it when I'm trying to reprimand them, so I have to hold off on the sarcasm.

"Get your feet off the desk please."
"Oh, my bad."
("Yes, your bad... attitude.')
Can't wait for the new year to start!
