The act of slapping the inner thighs of another person rapidly with one hand, imitating the motion of a salmon's tail swimming up-stream.
"I was standing at the bar, sipping my drink, keeping my cool, when I suddenly got salmon-tailed and was no longer able to maintain a stoic composure."

"There is nothing that breaks the ice better than giving a salmon tail"
by joojy-poojy March 4, 2012
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