1. One who examines or inspects a second-hand car or cars, often without really intending to buy anything. Primarily heard in Australia. This guy isn't a serious buyer, he's just a tire kicker.
2. One who wastes another's time. We need serious candidates for this position, so make sure to eliminate any tire kickers.
n. someone or something capable of defeating or surpassing all others. That idea is a real butt-kicker. He is an ass-kicker, but he at least rewards us for putting up with him.