1) The act of eating ass in an all-out manner. There is no second guessing, no hesitation, no asking for permission, no being a little bitch; you just go for it like you own their butthole. Tongue usually penetrates far beyond the rim- the true portal to their soul.
2) The destigmatization of anilingus:
Chow Ass: "I would never lick her butt (that's disgusting), but I would DEFINITELY chow her ass"