Use 'like blazes' to stress the intensity of an action or situation.

Intensity Accent

It's casual speech, suitable for informal conversations, not for formal writing.

Colloquial Emphasis

Can denote urgency or a need for quick action, though not always negatively.

Use it to describe something extreme, like the worst storm or pain you've felt.

Use for hyperbole to make a point, not to be taken literally.

Good for informal chats but too casual for essays or formal reports.