Drunk as a skunk
Heard in Waterford and Cork
To be so drunk that one flatulates involuntarily, so much so that the vulgar aroma eminatinating from one's posterior resembles that of a skunk.
Yer man is as drunk as a skunk boy... look at de dozey head on'im.
Your man is so inebriated that he flatulates involuntarily boy. Look at the slow witted character on him.