Board Thread:Theories and Rumors/@comment-68.50.112.157-20130326135547/@comment-5287114-20140803204202

Frankly, I wouldn't look into it too much - it's obviously a one-off joke to illustrate the oddities of life with Garmadon.

If I had to make a guess about its origin, though, I'd say it was just something Garmadon brought with him from his Dark Dimension. Odds are he had to eat something while he was growing his extra arms, after all...