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A linear brown fecal stain, produced when an unclean anus comes into contact with a (usually fabric) surface.

Much like a shit-stain or skid-mark, but the troll staff gains its name from the fact that it looks like a little brown stick that a troll could use.
Dont sit on the bed without wiping your arse first Jeeves, we don't want another troll staff.
by GeordieLover August 10, 2010
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