lark it up
Also, lark about. Have a noisy, exuberant good time. For example, We were larking it up when the supervisor walked in, or He's always larking about at night. These expressions employ lark in the sense of "to frolic," a usage dating from the early 1800s. Also see cut up.
|an extraordinary or unusual thing, person, or event; an exceptional example or instance.|
|a fool or simpleton; ninny.|
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