Guinea noises

Does anyone else's guinea pigs try to "talk" to you? Make certain noises to let you know they need to go to the bathroom, ect? Trying to get to know our lil guy's sounds still. He squeaks like normal, but I am wondering if the sudden loud screech is a "potty warning" sometimes it seems like it might be. And does the teeth chattering seem to be another "happy sound" or an "annoyed sound" ? I thought I had heard they chattered when they weren't happy..? TIA! ????????