Trackies are kids who participate in track, and probably cross country in high school. These kids are obsessed with their sport, and basically live to run. And then eat. And then sleep. And then run some more. And this is the wonderful cycle of a trackie's life.
Sometimes trackies would rather spend their saturday at a track or cross country meet than at a raging party. But they still have the same amount of fun because they're all so close and cool. Trackies are also often considered as ... well a cult.
Nick- Hey, should we invite Phil to the party tonight?
Sam- I don't know man, he's such a trackie, he might be at a meet.
Nick- But trackies are the most fun people around!
Jill- That was such a great run. Let's go get some pizza now.
Greg- Great idea, then I think I feel a nap coming on! It's what us trackies do!
Some form of stimulant drug in powder form used by long haul truckers to keep them alert and on track to their destination. Usually amphetamines.
Pete: Got any of that truckie dust left? I'm feeling a little tired and got a long way to go.
Rob: Damn right I do, lick your finger and have a dip into this bag!