N. Noun derived from the word customer, referring to those who are attempting to purchase drugs. A custie is not a good thing to be. A primary goal of the dealer is to rip off custies. It is, however, their own damn fault for being so stupid.
Custies are often those who use drugs occasionally at most and are not aware of the street value of a said drug, nor of what denotes quality. As such, they are easy targets.
Example one: Hey brah, I just sold some bunk doses to some custie chick.
Person one - They won't buy acid for $15 a hit, man. You got that shit for $6 a hit.
Person two - Dem's custies, nig!