A potentially useful website for defining words Webster denies the existence of...
..I say potentially because it's mired by fucktards who seem to think it's really funny to put their friends' names up here, and people who just have to type something, but can't be bothered to type an accurate or meaninful definition.
D00d, you'll never believe what I did to Joey JoJo Junior Shabadoo! I called him a dick on Urban Dictionary! Buuuuuuurrrrrrrrrrnnnn!
The opening at the lower end of the alimentary canal through which solid waste is eliminated from the body. The asshole is closely related to the sphincter which is a ringlike muscle that normally maintains constriction of the asshole or other orifice and relaxes as required to push your shitstool out of your body.
May the fleas of a thousand camels invade your asshole, good sir.