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1.
Really yummy food that is incredibly nang.
The person eating the delicious food may say "om nom nom" as they eat to show how much they are enjoying it.
"Om nom nom, that food was nomtastic!"
"Oh wow Becky! Your cakes were nomtastic!"
"Becky always makes nomtastic food"
by TheMasterWarriorSheep April 07, 2009
 
2.
used to describe what you're eating as fantastic.

2. it's so good that it needs it's own descriptive word that can't describe anything else as fantastic
This dinner is so good that it needs it's own descriptive word that can't describe anything else as fantastic so it's NOMtastic
by AleciaLJ May 29, 2009
 
3.
1:when something, mostly food is incredibly delicious,
2:if a guy or girl is extremely good looking
1:This sandwich is absolutely nom-tastic!
2: Wow, that guy is nom-tastic, I would date him!
by boo boo kitty123 November 10, 2009