What is "bungholes"

Usage examples of "bungholes".

From a point fifteen feet away several lengths of slow match stretched along the deck, like a thin octopus, the ends disappearing in the bungholes, where they went down into the powder and were held lightly in position by wooden bungs.

They're both bungholes who think they're too noble to shit, but never mind about that, I know the difference.

They’re both bungholes who think they’re too noble to shit, but never mind about that, I know the difference.