be a law unto (oneself)

be a law unto (oneself)

To do whatever one desires and/or ignore rules and regulations. If you need to delegate, I wouldn't ask Gina—she is a law unto herself, and it's hard to persuade her to do anything she's not interested in. How many times has Jason been arrested now? Geez, he sure is a law unto himself!
See also: law, unto
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

be a law unto yourself

behave in a manner that is not conventional or predictable.
See also: law, unto
Farlex Partner Idioms Dictionary © Farlex 2017
See also:
Full browser ?