The belief that pasta has distinctive characteristics determined by their factory workers and that this endows some pasta with an intrinsic superiority over other varieties.

Hatred or intolerance of one pasta type over others.
Lauren opened her box of Spiral Macaroni and Cheese to find one, lonely macaroni noodle in the mix. Lauren did not like this because she believes in Pastism.

Matt (the coolest guy ever, who Lauren adored) deleted his cute, awesome, most bestest friend in the world from facebook because he had reason to believe that she wasa fan of Pastism.
by MeowMeowRawr611 June 7, 2011
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A typical mental issue when someone stuck in the past and cannot moving on to present and future living.
First Case:
Grandma: Today's music are so crap, unlike music on my era, full of orchestra and twist everywhere
Grandson: Oh, come on, grandma, stop sticking with your pastism

Second Case:
Incel: I wish my love story are as good as one of my ex, even though my ex was passed away
Chad: Rather than stuck in pastism, why don't you fix yourself and get a life?
by Sir. B September 2, 2020
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