n. - a portion of drugs, usually a $10-20 vial of crack cocaine or heroin. Likely derived from the practice of splitting an ounce (brick) of cocaine into 8 portions (eighth or 8 ball), much like an album has around 8 or so songs, or tracks.
n. Street or streets where prostitutes stroll, looking for customers
"Tracks on my arms give me up as a junkie"
"Niggas who run fo' me, they don't even stash tracks, they keep 'em on 'em, right there in they ass crack" - 50 cent 'Back Down'
I'm an international player, I run tracks from coast to coast and on four continents.