Petrie's the Dutch Student, learning the ropes of the atomic age, a fresh face in a world of giants.
Example of how it's used in a sentence:
Person 1: Who's that Dutch Student in Oppenheimer?
Person 2: Petrie Willink as Dutch Student in Oppenheimer, fresh on the atomic scene dude!
A place that is full of people with the possibility of infection of viruses or diseases via close contact via people or "gross" environments, humid and warm temperatures, and people who are not minding etiquette in spread of coughing, sneezing, washing hands, or touching food.
John, that party sucked last night! Everybody was sticking their hands in the food and being all sweaty around each other. What a petri dish.
A patriotic asshole who won't admit that his country is inferior to others. Usually a Petrie is someone who is tall, ripped and most of the time they like .
Guy: Can you hear that gay tall dude constantly talking about America?
Other Guy: He's definitely a Petrie