Definitions by trainwreck and homewreck

PCB 

Premature Coupling Behavior. When your casual date or acquaintance begins to display unsolicited acts normally reserved for serious couples. ie hand holding, arm around waist, invading personal space, etc.

Kristen: "That guy at the bar just bought me a drink...Then totally tried to hold my hand!"

Corina: "eeeew, PCB"

PCB by trainwreck and homewreck March 10, 2009