The 'Dat Ass' meme features an image of a man biting his lip in an expression of intense approval or attraction. While its exact origins are linked to various reaction face threads on early imageboards like 4chan, it became a cornerstone of internet slang in the late 2000s. The phrase itself is used to express admiration for someone's physical appearance or, more ironically, for anything particularly impressive or aesthetically pleasing. Over the years, the template has evolved from a simple reaction image into a versatile tool for highlighting unexpected excellence or desirable objects in a humorous, exaggerated way.