Dave: "what happens when If I touch this?"
Person 1: "it doesn't matter, just don't do it"
Dave: "oh god, I broke it"
Person 1: "I just told you not to touch it...Fuck up!"
1. Screw something up, completely fail at something
2. Shortened way to say "shut the fuck up"
3. (Australia) Something you say to initiate a fight with some cunt. Basically "stand/get the fuck up".