f in the chat
What does f in the chat mean?
A semi-ironic show of sympathy. You say it (or just type 'F') when someone takes an L, big or small, a missed shot, a dumped player, a deleted tweet. The tone is mock-solemn; nobody is actually mourning, but they're acknowledging the loss.
Origin
Shortened from 'Press F to pay respects,' a quick-time prompt in the 2014 game Call of Duty: Advanced Warfare's funeral scene. Twitch and YouTube chats turned it into a flood of single-letter Fs whenever anything sad or embarrassing happened, and 'F in the chat' became the shorthand.