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Wiktionary
off the reservation

a. (context idiomatic English) Violating rules. adv. (context idiomatic English) In violation of rules; out of bounds.

Wikipedia
Off the Reservation

"Off the Reservation" is the twenty-first episode of the American television drama series The Killing, and the eighth of its second season, and aired on May 13, 2012. The episode is written by Nathaniel Halpern and directed by showrunner Veena Sud. In the episode, Sarah Linden ( Mireille Enos) frantically searches for a missing Stephen Holder ( Joel Kinnaman), Stan Larsen ( Brent Sexton) meets with several people regarding his reward to find his daughter's killer. and Darren Richmond ( Billy Campbell) returns to work.

Usage examples of "off the reservation".

Longarm figured Fred Ryan was likely still in Fort Smith that morning, but said he knew how to use a telegraph key, if push came to shove and the Signal Corps would patch him through to a line off the reservation.

And I can live with thatjust so's we're not doing something completely off the reservation.

And so they were caught, again, a year later, but this time off the reservation, and this time they found themselves dispatched to a year and a half of hard time because they'd been burglarizing a gun shop.

Now if this is off the reservation say so, but how on earth did a gunnery redbot like you come up for this job?

Hell, once he tells your people on Deluros that their illegal clone is off the reservation and killing people on his own, they'll probably double the reward.

Locals and Indians off the reservation shot and skinned the reptiles and sold them to the factory piecework.

Would it take having the local cops go off the reservation once in a while, to show the hoods the price of lè.

Any time you think I'm getting off the reservation, you can stop me.