A pistachio nut that is difficult or nearly impossible to open with just fingers. The opening in the shell is usually present (as opposed to completely closed), thus giving the eater "hope" that the insides can be obtained through normal means.
After watching his 7 year old repeatedly try to break open the nut, the man explained that it would take a few years before his son would have the means to crack the frustrachio.
(n) def. When a young, pre-pubescent boy and/or half-asian attempts to grow a mustache, only to be thwarted by their genealogical inability to grow any substantial amount of hair.
A patch of hair grown on a lady in her private area just above the vagina (fu fu) in a moustache shape. Note you can get many variations such as a handle bar fustache or Hitler fuatache.
She has a fustache on her fanny she shaped herself.