What does the slang term Bob in a mean?

The slang term "Bob in a" is not a commonly used phrase. It's possible it's a regional slang term or a specific inside joke within a particular group.

To get a better understanding of its meaning, you'd need more context.

Please provide some additional information, such as:

* Where did you hear the phrase? (e.g., in a movie, on the internet, in conversation)

* Who said it? (e.g., friends, family, someone you don't know)

* What was the situation? (e.g., casual conversation, serious discussion)

With more context, I might be able to help you figure out what "Bob in a" means.