Can be used in place of any word. In other words, it means anything and everything you want to it mean.
A TootsieNazi is basically someone who corrects what you said but replacing it with the word TootsieRoller. Usually they follow up with something along the lines of "Can you use Tootsie Grammar, please?"
Zealous Carpenter: "I'm a Carpenter!" :D
Depressive Meanie Head TootsieNazi: "You mean 'TootsieRoller a Carpenter.' Please learn basic Tootsie vocabulary before you talk again." >.>
Zealous Carpenter: "That too!" :D