Thoin, n.: that really awkward area where the thigh ends and the groin begins. Often used as a meter of the appropriateness of clothing, i.e., shorts/skirts that show thigh are considered "appropriate"; shorts/skirts that show thoin are not.
by maianess May 14, 2009
by Lannie February 12, 2005
by I'm not lying I swear January 20, 2022