A snarky expression to mock someone for saying something uninteresting or that adds zero value to the conversation.
Flo: I ran 10 miles yesterday!
Joe: Great, I'll put it in my memoirs.
The intense, irritable state of mind one enters while occupied with a task, usually leading to an unpleasant reaction when interrupted.
Honey, darling, light of my life, I can't talk about the stupid birthday party you're throwing for me, I'm currently in workmode.