a giant turd is typically used to describe someone or something that is exposed in a very public place, taking up way too much of that public place, with absolutely no place to hide.
i came over the crest of the hill and there was eddie, like a giant turd, in the middle of the road.
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Those who are around 6-7 feet tall, who go into public restrooms and proceed to use their height in order to look over the top of the stall at someone inside.
I was sitting in the stall in a bathroom the other day and a turd giant looked over the wall.
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The largest shit you ever taken
Guy: I just took a big giant humongous turd!