show (one's) butt(redirected from don't show their butts)
show (one's) butt
slang To act in a rude, obnoxious, or aberrant manner; to misbehave or act foolishly; to make a scene. Primarily heard in the Southern US. My Mammaw says that we can go down to the mall on our own, but she said not to show our butts or we'll be grounded! You need to start controlling how much you drink when we're out. You were showing your butt in front of all your colleagues!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.