1. A person who gets high off the drugs he/she is supposed to sell.
2. A person who pretends to be a drug dealer but is really a drug user who sells some on the side to maintain the habit.
3. A person who gets high off his own supply
Combination of the words custy & hustler .. Custy + hustler = custler .
Custy means crack
head or coke
head. Comes from the word customer.
Submitted by @
mac_fou