Poptart Effect 

Something that is so negative, that it is positive or something so positive, that it's negative.

Based on the old Poptart advertising of "So hot, it's cool. So cool it's hot".

Person 1: "That movie was so bad, it's actually good."
Person 2: "Yup, confirmed Poptart Effect."

Poptart Effect by Rear Naked Woke December 17, 2018

pop tart effect 

n. the blissful re-discovering of one of a pair; the moment at which one realizes they have more than previously thought; also referred to as Twix effect

"That was a delicious pop tart, sure wish i had one more. oh wait, i do. pop tart effect."

pop tart effect by Samuel Conner May 3, 2010

second Pop-Tart effect 

The wonder and excitement comparable to eating one Pop-Tart in a package, forgetting about the second one, and rediscovering the second one later.

I thought I was out of money until I looked in my old pants pockets, found a 20, and experienced second Pop-Tart effect.

second Pop-Tart effect by lovelibeam October 13, 2011