If you are referring to adult entertainment, titles containing "Big Asses" or "Mature" are common in that industry. For example:
: A common intensifier meaning very large or impressive. 3. Adult Media gig mature asses
The phrase "gig mature asses" does not appear to be a standard title for a movie, book, or mainstream entertainment product. Based on common slang and related media search results, it likely refers to one of the following contexts: 1. Music & Concert ("Gig") Reviews If you are referring to adult entertainment, titles
: There are documented concert reviews for events like the "Big Ass Tour" featuring bands like A Day To Remember or the "Big Ass Night of Deathcore" featuring Bodysnatcher . gig mature asses
The term "gig" most commonly refers to a live music performance.