To blurt out something without thinking; to say something unintentionally.
不经考虑，随口说出。
清·李宝嘉《文明小史》第八回虽然不至于通部滚瓜烂熟，大约一部之中，至少亦有一半看熟在肚里，不然怎么能够脱口而出呢？”
When she saw the surprise, she blurted out a comment before thinking.
Learn the next connected idiom: 脱口而出 (tuō kǒu ér chū) → 出人意料 (chū rén yì liào)
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