1.A situation in which a mistake by one person which is pointed out by another person; see gotcha, phr.. (colloq., phonetic spelling)
2.A situation in which an error or indiscretion by one person is deliberately caused by another person a mild form of entrapment with malicious or humorous intent; as, he was furious to be the victim of a gotcha "Kathleen "Kit" Gingrich (Sept. 23), 77, mother of former House Speaker Newt Gingrich... became famous as the victim of a "gotcha" interview by CBS's Connie Chung; the TV personality coaxed ("whisper it to me, just between you and me") out of Mrs. Gingrich a nasty comment attributed to her son concerning then-First Lady Hillary Rodham Clinton and then aired it."
3.A situation or attribute which tends to cause one to make an error; as, one of the main gotchas in learning English is the frequency of non-phonetic spellings.