stands for dealer; your loving and endearing friend who provides all of the illicit drugs to you. dilla is a more generic definition in that it stands for the concept of dealing, and how there is a dealer in all of us. Everyone has a specific drug they appreciate, they just might not know it yet. Exemplifies the concept that there is an outlaw in all of us, however focuses specifically in the context of drug dealing.
Person A:"My dealer came to my house the other day because i needed to get some dime bags"
Person B:"There's a dilla in all of us"
Person A1:"What up mike"
mike:"What up dilla"