A type of dance a girl does in the bar which involves a little grinding and a LOT of bumping, to the point where it hurts the guys junk that she is dancing with.
Jeff: "Damn dude my balls hurt, she was doing the haustace all over my junk last night!"
A variation of the word "hamster" used simply to make the word sound different for the sake of being different or annoying. It can also be used simply to bother someone who insists of proper pronounciations or believes it has some other meaning that you are not telling them about.
Boy: "Oh... yup... hamstar..."
Girl: "STOP SAYING THAT! WHAT DOES THAT EVENMEAN!"