A provincial adaption of a word where "y" or "ie" replaces the last part of the word. It is endemic to Australia and parts of the United Kingdom.
Provincial Australian language often deploys whyming to adapt to the local intelligence quotient (which is low to very low). Words are shortened to accommodate more beer.
Television becomes "telly." Hospital becomes "hossy." Football becomes "footy." Biscuit becomes "bicky." Biker becomes "bikey." Thingamajig becomes "thingy." And so on. It's an appalling yet slightly charming abuse of language.