When you try and act so smart but no one can understand what you're saying. Or when you have no answer but try to explain it, or (last one) when you're lying.
Using a lot of complex filler words in order to appear smarter and make your writing longer. Waffling doesn't change the meaning of what's written, but will often get you a good grade from idiot teachers.
Waffling: Because of the negative characteristics they often associate with scholastic institutions, certain pupils tend to experience animosity and contempt towards the academic apparatus, and attempt to resist progenitorial efforts to inculcate diligence into their offspring.