Noun. Describes a piece of feces partially protruding out of a dog's anus but not fully ejected; caused by the involuntary sphincter contraction during sudden fear, surprise, or sheer terror; the noun can be modified to describe how far out the feces made it, i.e.: quarter nelson, half nelson, full nelson.
Wow, did you see the green half nelson on that poor doggie when that bear jumped out of the bushes?
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