1. To ruin, bungle, or spoil something. I really crapped up that project at work—I'm going to get fired for sure!
2. To overrun or obstruct a thing or place, as with clutter, garbage, or undesirable things. Would you stop crapping up our apartment with all your silly figurines?
1. To bungle or make a mess of something: I really crapped up the project. It looks like they crapped it up again.
2. To fail to function properly: My computer crapped up on me, and I had to shut it down.