No Cap
No cap definition by Slang.net - The Slang Dictionary
This page explains what the slang term "No cap" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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No cap means "no lie" or "for real," and is used to emphasize that you are telling the truth, especially when describing something that is hard to believe. The slang term gained mainstream popularity in 2018.
When texting or online, the term may also be seen with the baseball cap emoji for extra emphasis. People may also use Cap or Capping when talking about people who are lying. The Cap term gained a lot of exposure in May 2019 when NBA superstar Kevin Durant used it in a tweet accusing reporter Chris Broussard of lying about texting with him.