An affliction describing the state in which something encountered during one's childhood is remembered as being of high quality, but when revisited several years later, is discovered to be of much lower quality than first thought.
"Remember how much we thought 'Dino-Riders' rocked when we watched it back in grade school? I saw it again last weekend... and man, we were retarded. That's some thundercats syndrome right there."
by Discocorpse January 16, 2009
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