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1 definition by dr.discrete

 
1.
The shard remnants of a failed ass wiping. When shit is spread through the ass crack via wiping, it leaves a trail, which is the 'tail'. The stinging or 'sour' feeling inflicted is caused by the acidity of your shit.
"your but gets itchy because you have a dirty sour tail"
by dr.discrete February 21, 2010
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