A mass delusion. Many Australians have distinct memories of little green Shrek raviolis. Some cases also include delusions of little green Shrek tongs specifically used for eating the raviolis.
The shade of green often associated with the colour of hit movie character Shrek's ball sweat. Pale yellowish green in most use cases but variable on how awful your imagination is.
Person A: "Dude how did you make your pancake Shrek-smegma green?"
Person B: "Oh I just used 20ml of extremely green food dye."
Person A: "Fuckin' miracles bro..."
on his anti-semitic Shekel Greene tour Eric "I'm gummy dammit" Trump said "Bob Woodward's desperate to earn 3 extra shekels with his book 'Fear'." Twitter immediately sent Eric to his room with no supper.