a person that started out as a good looking child and looked like they would continue to look good but then loses their cuteness at some point and is not attractive anymore later on in life
"aaaw he was such a cute child!"
"yeah its too bad he's a cocooner..."
"oh my god i know. how unfortunate"
when an ugly child becomes a hot teen or adult.
"wow alex was an ugly child!"
"yeah man but she's a cocooner"
"it's too bad her sister was a reverse cocooner"
"i know tell me about it"