Top definition
A sad orphan jellyfish, whose parents were eaten by a shark. His best friend is chuck the walrus. It can also be used as an offensive word to call an orphan of the genus Cuboza Chironex species, AKA a box jelly.
Bob-"man that guy is such a billy the jellyfish"

Joe-"yeah i heard his parents were eaten by sharks"
by Billythejellyfish101 March 17, 2010
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