Live one

//ˈlaɪv wʌn// noun, slang

Definitions

Noun
  1. 1
    Someone who is easily fooled, victimized, or ridiculed. idiomatic, informal

    "There's green as in greenhorn, meaning inexperienced and gullible. Those with a pitch to sell are going to spot a live one—in this case government with dollars practically falling out of its pockets—coming from miles away."

  2. 2
    Someone who is eccentric, nonconformist, or otherwise peculiar. idiomatic, informal

    "They've got a live one in the crowd, he's scary, he looks dangerous, demon possessed, he doesn't know who he is, he speaks in strange voices."

  3. 3
    A person, thing, or situation which is particularly interesting, noteworthy, or urgent. idiomatic, informal

    ""We got a live one here," he said as he speeds up in pursuit of a car."

Etymology

Possibly an allusion to hooking a particularly lively fish on a fishing line.

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