goatse

A disgusting picture of a man stretching his anus extremely wide. One of the oldest jokes on the internet is to link the picture to internet forums and chatrooms, renamed to look like something else like "happybunnies.jpg" . Often causes people to freak out.
> -Hey you know what goatse is?
> -no, what is it?
> -check this website out!
> -oh god it's horrible!
> -hahaha!