St Patrick's Shart

An unusual bowel movement occuring 1-3 days following the annual St Patrick's Day celebration held on March 17th. The bowel movement is most likely due to the overconsumption of Irish culture foods combined with copious amounts of alcohol.

Wife: Why is your green underwear on the bathroom floor and covered in shart?!

Me: Three words: Corn Beef Cabbage...

...And Jamison Whiskey.
Wife: Aw hell naw not the St Patrick's Shart again!