Thick of It is a 2024 song by British YouTuber and rapper KSI, featuring Trippie Redd, and its catchy chorus quickly made it a favourite for short-form videos and memes. The 'sus' version is a playful fan-made edit that leans into internet slang for suspicious behaviour, especially the Among Us-inspired joke about someone acting shady. Shared on soundboards and in edited clips, it spread because it turns a chart song into an instant reaction cue, letting creators flag a dodgy moment without saying a word.