Cool Irish Slang posters, not at all 'diddley eye'. In Ireland, we have a fairly random, and often completely impenetrable, number of Irish slang words and expressions. The 'Cat' graphic poster, the word translates to something bad or awful. It’s short for cat malojan or cat on a melodeon. You can imagine that a cat walking on a melodeon would make an awful sound. Add a frame or personalise it with your own colour choice and/or text.