A double or redundant plural of 'colossus' using both '-es' and '-uses' endings (non-standard).
This appears to be a playful or erroneous combination, possibly someone adding English plural '-es' to the already-plural 'colossuses,' creating a humorous over-pluralization.
If this word exists, it's probably in the Oxford English Dictionary marked as 'humorous' or 'dialectal'—it's the kind of thing someone says as a joke about English's chaotic plural system.
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