Phrase Meaning – What Does ‘Mercy Me’ Mean?

It's a phrase from journalism, meaning withdraw the story from publication, as when a story in an early edition of a newspaper proves to be inaccurate or unfounded (or annoys a big advertiser) and is removed from subsequent editions.

Over the years the phrase has been extended to broadcast and internet journalism.

An "angle" is a perspective on a story, a way to tell it, a way to frame the details so that it would be interesting to the readership.

When a person is "stuck", they're unable to make progress, like a car whose wheels are "stuck in the mud". If you're trying to solve a math problem, for example, but you can't envision the solution, you can say "I can't figure it out. I'm stuck."

for there means "with respect to".

The author is not making any progress with respect to thinking of an interesting way to tell the story.