Comment by will4274

> Hyperbole.

> 1. A figure of speech in which exaggeration is used for emphasis or effect, as in I could sleep for a year or This book weighs a ton.

> 2. A figure of speech in which the expression is an evident exaggeration of the meaning intended to be conveyed, or by which things are represented as much greater or less, better or worse, than they really are; a statement exaggerated fancifully, through excitement, or for effect.

> 3. Extreme exaggeration or overstatement; especially as a literary or rhetorical device.

From DuckDuckGo, quoting Wordnik, quoting The American Heritage Dictionary of the English Language, 5th Edition.