What is the meaning of idiomatic expression bees hum?

The expression "bees hum" isn't a common idiom with a specific meaning. It's likely a description of the sound bees make.

However, if you're thinking of a specific context or scenario, please provide more information, and I can help you understand the meaning.

For example:

* Is it used in a poem or song? The context might give the phrase a specific meaning within the work.

* Is it used in a conversation? The person might be using it literally to describe the sound of bees, or figuratively to describe something else.

Please give me more details, and I'll do my best to help!