get one's ass in gear

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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!
See also: ass, gear, get
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

get one’s ass in gear

and get one’s tail in gear
exclam. to get moving; to get organized and get started. (Usually objectionable.) Come on, you guys. Get moving. Get your ass in gear! Get moving, guys. Get your tail in gear and keep moving!
See also: ass, gear, get
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.