What does co-ed by wing means?

The phrase "co-ed by wing" is not a common or standard phrase in English. It's possible it's a slang term or a specific regional expression, but without more context it's difficult to determine its meaning.

Could you please provide more information or context about where you encountered this phrase?

For example, was it:

* Used in a conversation? Who said it? What was the topic of the conversation?

* Seen in writing? What was the type of writing (e.g., book, website, social media)?

With more information, I might be able to help you understand what "co-ed by wing" means.