Cap

Cap means "lie" or "false." The slang term gained popularity in 2018 as an alternative to the No cap term, which means "For real" or "No lie." This term and all of its derivatives probably found its way to TikTok because of the viral song “No Mentions” by YoungBoy Never Broke Again (the rapper also known as NBA YoungBoy or just YoungBoy) that TikTokers love to lip-sync to. After rapping about his “new Maybach” and counting “fifties all in hunnids,” NBA YoungBoy warns off any doubters, assuring fans that these claims are “no cap.”