A CB is a short form for Cock Block, and it is when a guy and his girlfriend try to do stuff but one of their friends is always there to block the cock. the CB doesntneed to be there the person can text message the person, or phone the person.
Man andrea is suck a CB.
Did you get any last night or was your CB there?
It was just us the two but she still was a CB by texting her.