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crusty salmon is when you stick your finger down the back of your butt crack after you havent bathed or showered for several days, and when you pull your finger out you find fishy smelling flaky scales on your finger
"whats cooking in the kitchen? smells like fish..."

"actually i hooked an itch in my butt crack and caught a crusty salmon"
by shampooisbetter October 31, 2009
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