A mythical skeletal muscle structure only found in those of African American descent adjacent to the plantaris and gastrocnemius muscles in the lower leg. It's action is run faster and jump higher.

Adj. Something that is expected to have a long lifespan by virtue of having existed for a long time, based on the lindy effect, named for the New York restaurant Lindy's, coined by Albert Goldman and popularized by Nassim Taleb.