Another way of saying that a person has drip. Drip theory is a theory in which all principles of having drip are met; a person is wearing 3 or more items that make them drippy.
Damn man, he has the chain, the ring, and the watch. He's definitely got Drip Theory.
Another form of "having drip" or "being drippy"; usually consisting of 3 or more articles of flashy/expensive/shiney jewelry. A theory in which a set principles are based on the amount of jewelry a person is wearing in close proximity of eachother on that person's body; usually consisting of 3 or more peices.
"DAMN! Dude has 3 watches on his wrist, he's definitely got drip theory."
"Are you gonna have a drip theory for tonight's party?"