A non-standard or humorous plural form attempting to pluralize 'colossus' with Latin and English endings combined.
This appears to be either a mistake, a joke, or a rare variant mixing 'colossus' with an incorrect pluralization attempt. Not a legitimate standard English word.
This word is so unusual that it seems like a joke—someone trying to pluralize 'colossus' twice or combine plural rules, creating something that no legitimate dictionary would recognize.
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