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!"
2. fuckup can also be used as a term of endearment between two friends in a funny situation that makes one of the people appear to be a complete idiot. it may not be used often, but adds comic relief to any situation. the person on the receiving end of this term, will not be offend even though it may be seen as inappropriate, usually the "fuckup" will be laughing or in shock from hear said term actually be used.
guy 2 " I need to turn in a few miles, this seemed like a good time to get in your lane. This always seems to happen to me!"
guy 1 "You Fuckup, where did u learn to drive?"
2. girl 1 "what are u trying to write, it looks like Lohn"
guy 1 " it says John what are you retarded?"
girl 1 " the J is backwards you fuckup! This is why i love you"
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".
2. Fuck up, Dazza.
3. Fuck up, cunt.