show one’s butt
v. phr.— «Showing his butt: A term used by officers to describe an inmate who is mouthing off or complaining about his treatment. As in: “That inmate was showing his butt.”» —“What the lingo means” by Adam C. Smith, Jo Becker St. Petersburg Times (Florida) Dec. 30, 1999. (source: Double-Tongued Dictionary)
Further reading
A ballicater is a jagged wall of ice that forms on a frigid shore when pans of ice catch on rocks and slush freezes over them. A Canadian woman who grew up in Newfoundland says she’s warned never to go near one. Ballicater, spelled several ways...
The Merriam-Webster.com dictionary now includes an entry for TL;DR, also rendered as TLDR. It’s a speedy way of dismissing overlong text or introducing a shortened version of something. This useful locution also inspired AI;DR, short for AI;didn’t...