adding ass to a word increases its intensity, much as a superlative or other such quantifier would. if something is
funny-ass shit it is more funny than if were described as merely funny
shit. the same goes for stupid ass
shit or stuff. ass is usually a compound suffix with another noun word like
shit, stuff, drink, etc. as in, that was a delicious ass soda. do not try explaining this particular use of this word to people who speak another language unless you want hilarity to ensue. there are rules governing its useage, but they are unclear.