1. A stereotype, but about Yetis. It has it's origins in the twelfth episode of internet puppet show, Transylvania Television. In the episode 'Because I'm A Yeti', main character Furry Ackermonster does a monologue explaining Yeti stereotypes. Hence Yeti-otypes.
2. When used in everyday conversation, a yetiotype is a ridiculous or unfounded steriotype about people.
An example of a yetiotype would be to say that all men are stupid.