Were ol' Webster to define it, the breakdown would look a lil' somethin' like this:
broccoli speak: (v) 1. to insist on speaking on a mundane topic without acknowledgement that Erin has just mentioned something epic. 2. to continue on with a blase conversation overlooking Erin's brilliance in the interim.
Friend: What would you like to have for dinner tonight?
Erin: I am writing a new screenplay. Bow before me.
Friend: So...broccoli then?
In short- broccoli speak: (n) a killing offense.