To call up a random business or person that you found in the phone book on the phone and then once the person answers the phone you don't say anything and you wait until the person on the other line hangs up.
An example of Ring Rong Bitch:
You: *Calls up Bob's Auto Shop*
Bob: "Bob's Auto Shop, How may I help you?"
Bob: "HELLO? ANYBODY THERE? FUCK YOU NIGGER!!!!!!!"