A hyperbolic superlative. Often used to express an otherwise unquantifiable difference between two or more subjects or concepts. "This coffee is epic, its so strong it could melt a tank."
Movie trailers should stop using so many hyperlatives, nothing is the greatest anything of all time.
Ross and Dan tumbled down a hill in an infinity looped shaped 69. They then proceed to fall off of a cliff where that final scene from Titanic plays and Dan dies from hyperactive turmoil disembodiment