PC

PC is an abbreviation for "private conversion" or "private chat", typically used by children of primary school age to indicate that a conversation of secret, serious, or important nature is about to take place

A PC is usually carried out in a quiet area away from other people's prying ears

"Cocoa, can you come over here with me - I need to have a PC with you?"

"Why are Alice and Carla over in that corner?"
"Oh, don't go over there, they're having a PC."