Someone (commonly in the group of people you usually go to lunch with) who dictates the time at which lunch is taken.
Steve is such a Lunch Nazi! He won’t let us go to lunch until 11:30… What an ass!
Lunch Nazi: define #2
An incredibly rude or insanely strict cafeteria worker. They like to make mountains out of molehills and make you stay after lunch and clean up the tables for talking in a whisper.
Mrs. Juten is such a Lunch Nazi! She made me pick up the floor for talking to Julie!