Anyone who looks or acts like the bums that hang around at stations but are not actually bums. The most distinguishing feature of a station rat is the smell - they smell as if they have smoked and eaten garlic for the past six years and not bathed once. This means you, station rat.
Station rat one: Gee, Dylan, yo smell like a kajigger!
Station rat two: thanks, Deanne, you too!
Station rat three: hey dudes! hows it smellin'?
Station rat one and two: hey roland
Station rat one: you smell like you've slept in a ditch full of cigarettes and bums
Station rat three: i haven't
Station rat two: i have
Other station rats: ........