She stopped typing. If she'd been using pen and paper, she would have screwed the paper up in disgust, but there wasn't a satisfying equivalent with email, seeing as everything was designed to stop you making a mistake. She needed a fuck-it key, something that made a satisfying ka-boom noise when you thumped it.
In this excerpt from "Juliet, Naked" by Nick Hornby, the character experiences frustration while composing an email. The absence of a physical medium like paper prevents her from expressing her irritation in a tangible way, as she reflects on how she would have crumpled paper in disdain if she were writing traditionally.
She yearns for a "fuck-it key," a fictional keyboard button that would allow her to vent her feelings with a satisfying destruction, symbolizing her desire to express frustration in a more visceral manner. The moment highlights the constraints of digital communication and the longing for a more cathartic form of expression.