Maybe meaningful is not the right word here...

I think meaningful is definitely the wrong word, hey, everything has meaning :)

IMO subs/methods should do something specific, clear and easy to explain

Like a purpose?

Dang, thats just meaning!

This is hard!

This is a problem with your list, you know what you mean by it, but didn't write that down :)

Hmm, A good subroutine is readable and has a well-defined interface, strong internal cohesion, and loose external coupling --- is the word Modular?