lark it up

lark it up idiom
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.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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