hairball
1. Literally, a clump of hair or fur, as coughed up by a cat. Also called a "furball." Gross, it looks like Fluffy coughed up a hairball on the rug.
2. Something that is in a state of disorder or confusion. I thought relocating these files would be a straightforward process, but it's turned into a real hairball.
3. Someone who is irritating or obnoxious, especially when drunk. If I get hit on at all, it'll just be by some loud hairball who'll spill half his drink on me. No thanks.