duff up

1. To physically assault someone; to beat someone up. A noun or pronoun can be used between "duff" and "up." Primarily heard in UK. Tom duffed up the drunken buffoon for making disparaging remarks about his sister. Two would-be muggers tried to rob a member of the Royal Marines, and he duffed them up right good. Hey, let's walk another way home. That shady group of guys could totally duff us up!

2. To defeat an opponent thoroughly and easily. A noun or pronoun can be used between "duff" and "up." Primarily heard in UK. We went into the game underprepared and unfocused, and our opponents rightfully duffed us up. You need to memorize your talking points, or you'll get duffed up in this debate. A: "I don't see us winning this game." B: "I know, I'm just hoping they don't duff us up!"

3. To bungle or ruin something; to mess something up. A noun or pronoun can be used between "duff" and "up." Primarily heard in UK. The boss said I would get the sack if I duffed up the reports again. Who duffed up these files? They aren't remotely in alphabetical order anymore! Sorry, I duffed up the math there. I owe you more money than that.