Green’s Dictionary of Slang

(Irish) Irish as learned while imprisoned in the prison at Long Kesh, Belfast.

2001		Sun. Business Post 4 Oct. 🌐 They communicate with each other by shouting pidgin Irish — also known as ‘Jailic’ — to each other and by writing notes, cleverly passed from cell to cell.
2006		Blanket (Belfast) 19 Nov. 🌐 Those on the H-Blocks created ‘Jailic’ to counter the Crown’s repression.