a) General academic underachievement:
1. To fail, flunk./b
2. To miss, skip or bail out of a lesson or other academic gathering.
b) To amaze/astound, usually by changing (oneself) beyond belief:/b
a2. "Damnit, the deadline's today... I guess I'm gunna have to willbob out of psychology."
b1. "Oh man, he kept his cool when I said his bird looks more of a man than he does... he has definitely willbob'd."