(often capitalized) A New York City area off-Broadway-style show, but not operating under the aegis of the theatrical unions. These are generally very low budget, with limited casts and even more limited production values, performed in unconventional, ad hoc spaces.

Of or pertaining to an off-off-Broadway production.

plural of off-off-Broadway

(sometimes humorous) A theatrical production performed in spaces remote from Manhattan, but nonetheless in the greater New York City area, and which otherwise fits the description of an off-off-Broadway show.

Of or pertaining to an off-off-off-Broadway production, or to the space they are performed in.

plural of off-off-off-Broadway