A person that can not or will not deficate in a public place. They have to go home or a familiar place to releave themselves; Excessively or affectedly prim and proper; excessively fastidious and easily disgusted. From the movie, American Pie, the Paul Finch character is called 'Shitbreak' by his friends because he can not take a shit in the school's bathroom. He goes home during the school day to use his own toilet.
"Shitbreak brings his own silverware to a restaraunt"