[h=2]Hyperbole[/h]Hyperbole is the use of exaggeration as a rhetorical device or figure of speech. In rhetoric, it is also sometimes known as auxesis (lit. "growth"). In poetry and oratory, it emphasizes, evokes strong feelings, and creates strong impressions. As a figure of speech, it is usually not meant to be taken literally.
Just in case they didn't know what it means and didn't want to look it up...