Whoop-Ass Meaning

(idiomatic, slang, US) To defeat or excel against (someone) in a competitive event.

Example: 1992 August, “Blues brethren”, SPIN, volume 8, number 5, SPIN Media, ISSN 0886-3032, 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."
1999 August, Kevin S., “Intel bounces back”, Maximum PC, volume 4, number 8, Future US, ISSN 1522-4279, page 18:
  Intel knew the K6-III 450 with its 256k built-in cache would whoop ass on the Pentium II series.