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 'Dirtbird' graphic poster, refers to someone with a filthy mind, or mildly perverted! ‘I will not, you’re are an absolute dirtbird’. Add a frame or personalise it with your own colour choice and/or text.