A bucket head is someone who is very dumb and is usually excluded from social gatherings. Bucket heads are lonely and often contemplate life and why they should bother living.
girl: hey that girl looks lonely boy: don't bother with her, she's a bucket head
1. Captain Murphy's imaginary girlfriend on "Sea Lab 2021". Constructed from a mop and an upside down bucket with a poorly drawn face. She is somewhat of a slut.
2. Name given to the hated girlfriend or wife of a friend. Her true name is irrelevant.
1. Marrco! Get your hands off of Bucket HeadWendy!
2. He used to be cool before he hooked up with Bucket Head Wendy.