perfidy

Buckethead,

Being a linguistic descriptivist, I feel that whatever usage of "thing(y/ie)" butters your bagel is the one to use. Other usage would suggest both "thingie" and "thingy" as correct, since each is used interchangeably as a diminuitive: "bootie" and "booty" for baby's shoes, and "kitty" and "kittie" for small cat, for example.

But beyond such heady concerns, "thingy" is undoubtedly the correct term. "Thingie" is just wrong.