1) It has its ups and downs 2) Plaything of a sort 3) Toy for bounding 4) Toy for jumping 5) Toy on a spring 6) Toy that hops 7) Toy with a big spring 
A pogo stick is a device for jumping off the ground in a standing position, through the aid of a spring, or new high performance technologies, often used as a toy, exercise equipment, or extreme sports instrument. The pogo stick is currently undergoing a renaissance through its accelerated entry into the world of extreme sports via the new sport o...
A pogo stick is a child's toy invented in the early 1920's consisting of a pole with two handles at the top and two foot rests at the bottom, attached to a powerful spring at the bottom so that by standing on the foot rests and holding the handles one can propel oneself along by jumping.Pogo stick is British rhyming slang for the penis (prick).
[n] - plaything consisting of a pole with foot rests and a strong spring
noun plaything consisting of a pole with foot rests and a strong spring; propelled by jumping