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1.
Someone who always needs to put in the last word of an argument, for better or worse, to achieve some minor piece of victory.
"God, let's just stop this stupid argument."

"Yeah, OK. It's like, we both know you're a total hypocrite, so yeah, let's just stop this. Where do you wanna get lunch?"

"God, you're such a fucking Last Word Nazi."
by Patrick George October 26, 2009
 
2.
The kind of assholes who always have to have the last word in an argument, no matter what, in order to preserve their self esteem.

They will usually try to change the subject once they know that they've lost.
normal person: "okay dude shut up this is serious"

last word nazi: "don't tell me what to do."

normal person: "why couldn't you just say 'okay fine' like a normal person?"
by croppers May 26, 2010