joey /ˈd͡ʒoʊ.i/noun 9forms 1 noun9 •a baby kangaroo, or the baby of a similar animal whose mother carries it in a pocket on her bodyAs soon as a joey is born, it crawls into its mother's pouch. The joey grows in the pouch. — 2006 •(Australia, slang) A young child. •(UK, slang) A member of the Royal Marines. •A kind of clown. •(slang, offensive) A stupid person. •(slang, offensive) A person with cerebral palsy. •(UK, slang) A parcel smuggled in to an inmate."Visit in two days though," said Tommo. "Hang in there mate, got a joey coming, we'll be sweet then." — 2012 •Ellipsis of joey word.Among the kangaroo words that yield the most joviality and joy are those that conceal multiple joeys. — 1998 •(slang, no longer used) A fourpenny piece, or its value; fourpence worth. formsjoeys