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

"Professional Cock-blocker" someone who gets in the way of a person and their significant other spending time together and/or having sex so often they exceed the level of cockblocker.

"Your little brother is a PCB, he's always following us around."

PCB

perfect cherry blossom

a Touhou game

This a PCB reference?
yes it's a perfect cherry blossom reference.

PCB

A secret underground society that will one day rule the world.
The only people who know what "PCB" actually means are the members of "PCB".

person1: Have you ever heard of PCB?
person2: Um...I don't think so.
person1: K.

(Person 2 is secretly a member of PCB)

PCB

Princess Cock Block - a girly type guy who "plays for the other team" and cock blocks his friends.

That Andrew is such a PCB. No one ever takes a girl home when he is around.

Friend: Hey girl how are you?
Girl: I'm good, about to leave. How far is your place?
Friend: A couple minutes down the street.
Andrew (PCB): HE'S DRUNK!!!
Girl: Wait a second, my friends are calling me. I have to go...

PCB

P- professional

C- cock
B-blocker

Chasidee is a PCB

PCB

-Pre Coachella Boner; The act of cultivating a throbbing erection from thoughts leading up to the annual event known as Coachella.

You:" Yo, I hear the rumor is OutKast is performing at Coachella this year"

Friend: "I got a PCB just thinking about it..."