Personally I think Mac may have imagined Bloo like a person who's wearing a sheet over his body to dress up like a ghost. There are no arm holes, so to pick up or hold something they just push the sheet out around their hands. And they have feet and can walk, you just can't see it under the sheet.
Basically Bloo's body works under the same physics, only instead of being covered by a sheet, that's his real body.
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