The phrase stresses how remarkably terrible something is, beyond normal expectations.

Emphasis on Bad

Sometimes used sarcastically to humorously exaggerate a minor inconvenience.

Sarcasm Usage

The phrase can be attached to a wide range of nouns, not limited to common collocations.

Emphasizes the severity or noteworthiness of someone's behavior or a situation.

It's common in casual conversations, but avoid it in formal contexts.

The phrase carries a strong negative feeling, so it shouldn't be used lightly.