Green’s Dictionary of Slang

used as a synon. for an un-named human attribute.

2001

K. Sampson Outlaws (ms.) 12: Plus they like to think of us boys as half thingy. They think we’re the wild bunch and that. [Ibid.] 27: He still ripped a tiny bit of the wrapping off, just to show that he was thingio, the kiddie and that.