1.used in place of far more devious words
2. used several times in sequence to annoy someone
3. used when there is just nothing to say and you want to break the silence
1. When Jimmy told his son to wash the car, his son replied "Robble my knobble!"
2. "Robble robble robble robble robble..." etc.
3. An eerie silence filled the room, Jimmy did not like silence, so he shouted "Robble robble!"