river rash
n.— «“It’s like I told the U.P.S. man the other day, it’s the challenge,” said Mr. Ramsey, who has a tattoo of a catfish on one shoulder and whose forearms are cross-hatched with battle scars, known in noodling circles as “river rash.” “Anybody can throw a trout line in the river and hang a perch on it. But very few people are going get in the river, and wade around and look for a hole in the bank, stick your hand in there, and hope it’s a catfish.”» —“The Catfish Are Biting (and It Hurts)” by Malcolm Gay in Cowden, Illinois New York Times July 28, 2007. (source: Double-Tongued Dictionary)