The characters `历史 (lìshǐ)` combine to mean “history.” Adding `黑 (hēi)`, meaning “black” or “dark,” metaphorically “blacks out” this part of one's personal history. It implies it's something one wants to conceal or keep in the dark, not because it's evil, but because it's deeply embarrassing.
The term 黑历史 is a loanword from the Japanese 「黒歴史」 (kuro rekishi), which originated in the 1999 anime *Turn A Gundam*. In the show, it referred to a catastrophic period of past wars that had been sealed away and forgotten. The term was adopted by Chinese ACG (Anime, Comic, Game) communities and quickly spread to mainstream internet culture. Its meaning shifted from a “cataclysmic forgotten history” to a “personal embarrassing past.” Comparison to Western Concepts: While you could translate 黑历史 as “skeletons in the closet,” there's a key difference in connotation.
This term reflects the modern reality of a persistent digital footprint, where anyone's past can be easily “dug up” (挖, wā). It provides a humorous way to cope with the universal experience of cringing at our former, less mature selves.
黑历史 is an extremely common piece of internet slang, especially among younger generations.