The action of being angsty (anxious, depressed, moody, negatively emotional). Usually practiced by teens.
I spent the afternoon angsting alone in my room.
(verb) the act of banging your head repeatedly against the nearest wall and saying "angst" over and over in a monotone voice.
Rick was not surprised to find Page angsting, he knew she had just lost a contest to get free passes to The Wizarding World of Harry Potter.