A "zombie jam" occurs when a group of zombies accumulate in a group in a river or stream, causing a blockage, much like a log jam. Zombie jams are quite dangerous, as they can drift downriver and catch boaters unawares.
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A "zombie jam" occurs when a group of zombies accumulate in a group in a river or stream, causing a blockage, much like a log jam. Zombie jams are quite dangerous, as they can drift downriver and catch boaters unawares.