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get (one's) ass in gear
rude slang To start being active or prepare to do something, particularly when one is inactive. I know you said you would take out the trash, but get your ass in gear and do it already! I really need to get my ass in gear and finish writing this paper—it's due tomorrow!
get your ˈass in gear
(also move your ˈass) (taboo, slang, especially American English) a rude way of telling somebody to hurry