Green’s Dictionary of Slang

hoopy adj.

[? SE hoop, i.e. var. on loopy adj.]

crazy.

[US]G.V. Higgins Patriot Game (1985) 178: There’s others’ll tell you, I came in crazy and made everybody else hoopy.
[US]D. Lehane A Drink Before the War 233: [A]ll I saw was this piece of shit who had abused me for twelve years, and I...went a little hoopy.".