whoop ass

From English whoop (variant of whip) + ass.

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whoop ass (third-person singular simple present whoops ass, present participle whooping ass, simple past and past participle whooped ass)

1. (idiomatic, slang, vulgar, US) To beat or strike.
   • 2015, Rhonda Cannon Jones, In the Secret Place of Brooklyn Stone, Volume 1, Publishamerica, →ISBN:

     Back in the day, he turned over some tables when he found out thieves were in God's temple and that's what we're doing now, turning over some tables 'cause we found a violator of the law, and we shall whoop ass and teach him...

2. (idiomatic, slang, vulgar, US) To defeat in a fight.
   • 1992 August, “Blues brethren”, in SPIN, volume 8, number 5, SPIN Media, →ISSN, page 55:

     I said "Hello Papa," and he said, "Well, I'll be darned, I'm gonna get off of this piano and whoop yo' ass."

3. (idiomatic, slang, vulgar, US) To defeat or excel against (someone) in a competitive event.
   • 1999 August, Kevin S., “Intel bounces back”, in Maximum PC, volume 4, number 8, Future US, →ISSN, page 18:

     Intel knew the K6-III 450 with its 256k built-in cache would whoop ass on the Pentium II series.

   • 2006, Charlie LeDuff, US Guys: The True and Twisted Mind of the American Man, Penguin Press, →ISBN:

     I felt not like a football player, but like a man on a couch with a really good view. The players on the bench talked about whooping ass and steroid use and the cheerleaders' tits.

This can be used both transitively (whoop someone's ass) or intransitively (whoop ass on someone).