poser (n.)youdaoicibaDictYouDict[poser 词源字典]
"one who practices an affected attitude," 1881, agent noun from pose (v.1); revived in teen-ager slang by 1983. Meaning "question that puzzles" is from 1793 from pose (v.2); earlier it meant "one who asks testing questions" (1580s).[poser etymology, poser origin, 英语词源]