There was a presentation day for the MSc I was participating in as a student.

The teacher was talking sassy things to a student that replied likewise and I stood up for him with reasoning and he just didn't like it (he wanted to be the boss in the class).

Then it came the time for my presentation. It was about augmented reality that I knew a lot of. So I opened the presentation and immediately the teacher threw some sassy things to me. So I stayed at the first page of the presentation that had the title and some fancy photos and screenshots and I started speaking about augmented reality from the ground up.

Needless to say, when I got to the second page the teacher had nothing bad to say and was almost admiring what I had to say.

I think you can call that badass.