A chill party or gathering, usually involving beef stew. A dry party - no alcohol UNLESS you're adding it to the stew and drinking the leftovers. Different than a business casual boil, which requires black pants and a different type of stew.
Al
Known in certain regions as "beef stewsday"
Customer at the coffee shop I work at: Hey, what are you doing this weekend?
Me, the barista: my roomie and I are just having a casual boil, nothing crazy
Customer: What?