Deets are details: the small facts, the who-what-when, the bits of a story people are hungry to hear. It is a clipped, playful form of details, and the ee spelling is there on purpose so you say a long sound — deets, not dets. Young people use it in texts, group chats, and casual talk (Give me the deets. Spill the deets.). Older speakers and careful writing almost never do. It is nearly always the deets, in the plural, the same way we say the details. Friendly, a little nosy, and far too loose for an exam, a job email, or a news report.

細節（年輕人口語、網路用語，常直接講 deets）