lark it up

lark it up

To have a very fun, enthusiastic, and lighthearted time. I'll always think back fondly of the summer after high school, larking it up each week with my friends all around town. The boss chastised us for larking it up instead of getting to work on the project.
See also: lark, up
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

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.
See also: lark, 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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