Nazi: A political party with Lofty Goals and willing to kill all who stood in their way, or disliked.
Taco Nazi: One who sets or brags about going to do large, big or impressive things in life, but carries these dreams out in cheap, poor half-assed way.
Taco Nazi: No, do you see a drink in the picture?
Customer: You're a Taco Nazi!
Taco Nazi: Do you want anything or not?
When alone with a girl and her mother constantly checks up on the two of you, the mother is referred to as a "taco nazi," due to her unceasing oversight of your intended mate's snatch.