A person who views the world with extreme disdain. They can be spotted by anti-social behaviour which includes, inter alia, incessant complaining, not answering the phone when friends call, and telling everyone and anyone to fuck off.
He's been acting all hauschildt ever since his girlfriend had sex with that guy.
Someone or something that bites your ankles.
To a postman, an ankle biter is often known as a dog.
To an adult, an ankle biter may be a toddler.
To hikers, an ankle biter is sometimes a tick.
And so on.