Green’s Dictionary of Slang

irrits n.

In phrases

give someone the irrits (v.) [abbr. SE irritate]

(Aus./US) to annoy, to irritate.

1984		G. Matthews Further Adventures of H. Finn 130: ‘Quit mystifying. It gives me the irrits’.
1991		E. George Womyn Is Perfected 58: Nor was it that fact that Merle was the youngest that gave her the irrits.
2000		Hartford Courant (CT) sect. D 5 Sept. 27/4: G’Day from Down Under [...] Irrits — to be irritated.
2000–02		Macquarie Dict. 🌐 irrits plural noun 1. a feeling of annoyance or irritation: have the irrits. – phrase 2. give (someone) the irrits, to make (someone) annoyed.
2011		J. McCredie Making Girls & Boys [ebook] I’m a fairly chilled kind of person but suddenly getting the irrits over tiny things and then having a disproportionate level of pissed-offedness [etc].