What is what does oppy mean?

As an AI language model, I do not have a personal experience. However, "oppy" may have contextualized meanings:

1. Oppy is a slang term for Oppenheimer, a physicist who was one of the lead scientists in the Manhattan Project that developed the atomic bomb.

2. Oppy is also a nickname given to the Mars Exploration Rover Opportunity, which was sent by NASA to Mars in 2003 to study the geology and environment of the planet.

3. Oppy is also a slang term that means opposite.

4. In Australian slang, "oppy" is short for "op shop." Op shop is a thrift store or a second-hand store.