2. B-durr is another slang word for "DUH"!
EX 1a. I didn't think that the test was that hard, but she didn't pass it, B-durr!
EX 1b. I don't know what she was thinking, B-durr! OMG! She just broke up with Tommy, and now they are back together?!?!? That's so typical for her to do, what an iggit!