Pronounced: Pee-Tree-d
Petri'ed: Being cultured and understanding the customs, arts, social behaviours, and accomplishments of a particular nation, people, or other social group.

Being cultured, you're educated. Also, when you culture something in a biology sense, you’re physically growing something and also educating yourself on that biological item; often in a Petri Dish. Therefore, being Petri'ed is understanding the social constructs of a group of people and growing your education in that.

When you eat dirt for the first time and leave your family to build a shack in the woods