Juming Sound. Ending phrases with -pyon was popular in Japan in the 80's. Especially Uso-pyon! It means "Just Kidding!" Sometimes it is added to the end of someone's name. Usually not said loudly.
Thats really cool. pyon!
C'mon lets go! pyon!
the sound a rabbit makes is refered to as 'pyon' in japan. It's also used to make sentences sound cute.
Rabbit: pyon pyon
Person:(to imitate the rabbit) pyon!
To sound cute:
shinn: so chiyo what are you going to eat for lunch?
chiyo: ahh...pyon pyon, i don't know..a salad?