duff up

verb

1. slang.
   tr, adverb to beat or thrash (a person) severely

Example Sentences

His career saw him in and out of jail, constantly being sued, refusing to pay alimony, impregnating and abandoning a string of domestic servants, conspiring to duff up random clergymen, and at one point abducting a teenage girl and keeping her as a sex slave.*

From Literature

I think, at election time, it is inevitable isn't it that people want to get more tribal, they want to duff up the other side.

From BBC