A ridiculously fictitious telling of a story. Usually told by a g sherm of some sort. the telling of this story must occur in the least sensible of all possible settings and must annoy the listener(s) beyond all sanity. a shark tale would could be something like: "This Italian dude I chill with back home was surfing once, and he got eaten by a shark. The thing swallowed him whole up to his waist so he pulled on its gills and it spit him back out."
Oh man, that g sherm just told me the biggest shark tale. What a stupid little g sherm