A verb form of "chimo" (a shortened word for child molester). To be creepy in anyway, not just towards small children. 1. To stop by somewhere in order to creepily check out people you are sexually interested in.
2. looking at people's facebook or myspace photos without their knowledge.
"Jeff, are you chiming in on that one girl on facebook?"
"Alright, Jason, I'm about to go chime in at the gym."