whup /wʌp/ BrE AmE ( also whop ) verb ( past tense and past participle whupped , present participle whupping ) [transitive] informal especially American English
[ Date: 1800-1900 ; Origin: whip ]
1 . to defeat someone easily in a sport or fight:
I’m gonna whup your ass (=defeat you very easily) .
2 . to hit someone and hurt them very badly, especially using something such as a belt