Best definition
Yeah Mate Yeah
aussie slang for affirmative. and also the name of an awesome website.

Q. Are u hitting the piss tonite mate?

A. Yeah mate yeah

Q. So the car a runs alright?

A. Ohhh yeah mate yeah, its a fuckin ripper

Yeah Mate Yeah: define #2
Yeah mate yeah
A way to silence someone by agreeing to what they just said. Usually said with a strong scouse accent for emphasis. The longer the phrase can be extended with additional words, the better.
Steve: hey have you thought about becoming a vegan?

Ted: yeah mate yeah, okay mate very good that yeah