Used for dramatic effect, not necessarily to mean someone looks near death.

Exaggerated Expression

Often used humorously to acknowledge one's own state of exhaustion.

Humor in Fatigue

Best used in informal settings among friends or family.

Focuses on internal feeling rather than external look.

Used to hyperbolically express one's feeling of being very tired or run down.

People often use this phrase to openly share their struggle with tiredness or illness.