My favorite term I learned last week is "non consensual TED talk" to describe spontaneous bloviation at a meeting or conference.
I am quite embarrassed to say that I am the person at work that gets animated and gives non consensual TED talks. In fact I have made embarrassed jokes about it in the past. 
EDIT: I will never be using this term again. It was pointed out rightly that this term using it minimizes sexual assault in a thoughtlessly insensitive way — in an industry where women are already systematically marginalized


