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1.
The combination of not+optional; having to do something, not being able to decide against it, its not optional.
"Hey Morgan, want to go to Florida for spring break?'
"Oh, I dont know"
"Too bad, you're going. Its Noptional"
by somerandomdude1257 December 01, 2013
 
2.
Not an option.
She's wants you to watch the latest Twilight movie with her and miss the opening game of the NBA finals? That's completely noptional! Bros before hoes, man. Bros before hoes.
by kokujin0125 November 24, 2009