The definition of kick ass is something that is really impressive or powerful.
An example of kick ass is a great new sports car.
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A kick ass sports car.
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adjective having a strong effect on someone or something; forceful; powerful exceptionally good; spectacular, impressive, etc. Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc. kick-ass - Phrases/Idioms
kick butt. Punish or discipline harshly; also, defeat soundly. For example, That foreman's furious; he's going to kick ass before the day is over, or Our team is out to kick butt today. [Vulgar slang; 1940s] The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.