Did you mean Easter egg?
Definitions
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Examples
“That was, until, Yelp's most recent iPhone app got approved in the store with an easter egg that, after shaking the device three times, enabled an Augmented Reality view.”
“An easter egg in the boot firmware let you enter the character "L" and be told that the built-in 8K BASIC was written by Micro Soft and Bill Gates.”
“Yelp hid their easter egg behind shaking the device, which isn't always the most intuitive action to take on an app that contains some maps and lists.”
“Online Observations » Blog Archive » Google puts easter egg in iPhone”
“Somebody quick make an easter egg that shows off Job's old liver … it'll sell like hotcakes.”
“This is a re-make of the super secret Sega Saturn easter egg that could be found in Exhumed”
“At the very least, we would have liked to have seen our Cthulhu toy used in place of the stop-motion model as an alternate take or easter egg on the DVD.”
The LNN interviews Paul Blake from ToyVault : The Lovecraft News Network
Lists
These user-created lists contain the word ‘easter egg’.
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Words Covered in Faery Dust (E)
words that evoke magic, mystery, mayhem, magnificence or anything else that glimmers in the grass
earthwork, easter egg, ebony, eclair, eclipse, effervescence, effigy, egret, elegant, elixir, ellipse, elude and 52 more...
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A Good Egg
Such a versatile word.
good egg, bad egg, egghead, eggbeater, egg slicer, egg tester, egg timer, egg cup, egg gatherer, egg and dart, egg binding, eggplant and 44 more...


_Wikipedia
Also Easter egg (Media)
A virtual Easter egg is an intentional hidden message or feature in an object such as a movie, book, CD, DVD, computer program, or video game. The term draws a parallel with the custom of the Easter egg hunt observed in many western nations.
_Wikipedia Feb 17, 2008