A 'Shimmerick' occurs when a person tells a story and/or explains a situation in such detail where the original point of the story or situation has been lost.
Ky "So...wait...what? I'm confused...what were we talking about? Oh....it's kind of like when....."
Also slang for exceptionally runny & smelly feces.
"That poor little shimric from down the street rode by in his mother's car and he had finger-painted the window with his own shit. The worst part he was licking it, too."
"I visited Iowa and I brought back the worst case of shimric. I was on the toilet for days."