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I think you are all being highly immature and misunderstanding the deeper meaning behind the guild name. According to merriam-webster dictionary a poop (noun) is an "enclosed structure at the stern of a ship." It can also be used a verb to mean taking seas or waves over the stern. From this it's quite clear that their guild is referring to the fact they will be crashing upon their enemies like the waves in the ocean and are a force to be feared.