Pogue is a slur used to describe Irish in a derogatory way. Possibly from Irish Gaelic "pogue mo thoin", meaning "kiss my arse". Could also refer to the Irish folk group "The Pogues" who did popular traditional Irish songs.
The word Pogue is a racial slur that has been used historically to degrade and dehumanize irish. The word is still used by some people for this purpose, and it is seen as offensive and hurtful to irish. If you are unsure about whether or not it is appropriate to use the word Pogue, it is best to err on the side of caution and avoid using it in any situation.