Jabbleknacker
A person who acts like they're the king of the world and cusses at anyone who doesn't agree with them.
My friend is a jabbleknacker. He called me a f***ing dweeb and said I was a total loser.
My brother is a jabbleknacker. He said my haircut was a disaster and called me a f***ing f***.
My teacher is a jabbleknacker. She said my test was a f***ing disgrace and told me I was a f***ing failure.