1)Having chaffed asshole. When you have wiped your ass a lot, mostly during diarrhea, and you ass has become extremely dry or chaffed.
2)The feeling of having wiped with pine straw.
Cave man 1: Why is Bob walking funny?
Cave man 2: Oh, he has diarrhea and he ran out of leaves so he had to use pine straw to wipe, so he has Cave Ass.
Cave man 1: HAHAHA!
The Wailing Caverns or wc is an instance in World of Warcraft for approximately levels 15-21. An extraordinarily long and overly complicated dungeon, with poor groups (pugs) it can take a horrifyingly long time, though the rewards (xp and items from quests, plus loot and xp from killing mobs) sometimes make it worth it.
Usually, however, it takes way longer than expected, making your ass fall asleep and become numb. Can be used whenever something forces you to stay at the computer far longer than expected.
Burned-out raider: Oh god, this naxx25 started out so well, then we wiped on 4horsemen for so long I got some major Wailing Caverns Ass.
asscave was the original image of a woman's gaping asshole, scattered with nearly a dozen clitoral piercings, while her rosey red fingernail polish shined brightly on her hands that were spreading her ass. this legendary image was found years before goatse images started even appearing. a quick google image search for this name should produce results.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi