An archaic or humorous plural form of 'bargee,' following an older English pluralization pattern.
This appears to be either a historical variant or a jocular formation mimicking Old English plural patterns (like 'geese' from 'goose'). It's extremely rare and likely not standard modern usage.
This might be a delightful example of playful or mock-archaic English—someone creating a 'goose/geese'-style plural as a joke—which shows how native speakers intuitively understand English's historical pluralization patterns even when they don't use them.
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