The phrase uses finna, a slang form of fixing to, to announce an intention in the most direct way possible, with the pit referring to the mosh pit at a live show. Clips like this spread online because the line works without context, turning a simple plan into a bold, funny warning. It has become a shorthand reaction for choosing chaos at concerts, festivals, parties, and sporting crowds, and its short length makes it easy to loop, caption, and drop into fast edits.