Green’s Dictionary of Slang

(Irish) suffering, whether mentally or physically.

1800		M. Edgeworth Castle Rackrent (1832) 82: But my lady Rackrent was all kilt smashed. [footnote] I’m kiltall over means he is in a worse state than being simply kilt. Thus, I’m kilt with the cold is nothing to I’m kilt all over with the rheumatism.
1836		Marryat Japhet 12: Sure enough, it cured me, but wasn’t I quite kilt before I was cured.
1843		W.Thackeray Irish Sketch Book (1901) 141: There was a rare kicking, and sprawling, and disarrangement of petticoats, and cries of ‘O murther!’ ‘Mother of God!’ ‘I’m kilt,’ and so on .
1918		K.F. Purdon Dinny on the Doorstep 205: Dinny, who wasn’t killed really, only kilt – a very different thing.
1928		L. Mackay My Oul’ Town 50: I’m jist about kilt walkin’ it ivir since.
1979		J. Morrow Confessions of Proinsias O’Toole 39: Long after hostilities had ceased he kept turning up on suburban doorsteps [...] his brief speech – ‘Yer man’s kilt’.