1. To produce something on a type writer or computer. A noun or pronoun can be used between "punch" and "up." Stephen, I need you to punch up a letter for me. I just want to punch these notes up in my word processor before I head home.

2. slang To something more dynamic, interesting, exciting, lively, etc. A noun or pronoun can be used between "punch" and "up." Your writing is quite nice, but you could stand to punch the story up a bit. They really punched up the sequel with a lot of action scenes.

3. slang To make jokes at the expense of a person or group that is in a stronger social, political, or economic position relative to oneself. The comedian suddenly started telling jokes about people in the ghettos, and I got really uncomfortable. Comedians should only punch up, if you ask me.