mess someone up

mess up

1. To make a mistake. I'm worried that I messed up the last question on the test—it sounds like no one got the same answer as me.
2. To cause one to make a mistake. In this usage, a noun or pronoun can be used between "mess" and "up." I got all flustered when the boss walked in during my presentation—it totally messed me up!
3. To create chaos or disorder. In this usage, a noun or pronoun can be used between "mess" and "up." I'm sorry that there are toys all over—the kids really messed things up in here.
4. To damage or harm someone or something. In this usage, a noun or pronoun can be used between "mess" and "up." If you don't regularly get your oil changed, you could really mess up your engine.
5. slang To physically strike someone, usually severely or repeatedly. In this usage, a noun or pronoun can be used between "mess" and "up." Stay away from that rival gang—those guys could really mess you up.
See also: mess, up

mess someone up

tv. to beat someone up. (Underworld.) The boss says me and the boys is supposed to mess you up a little.
See also: mess, someone, up