frozen chicken head
n.— «Hard ski surfaces come in many forms, from “boilerplate” or “bulletproof” after a January thaw/freeze (Vermont natives like to say the snow “toightened up” after the thaw) to “frozen chicken heads,” when spring slush refreezes overnight.» —“Ice advice: how to handle the hard cases” by Bill Kerig, Eric Deslauriers, Lito Tejada-Flores, Harald Harb Skiing Feb. 1, 1998. (source: Double-Tongued Dictionary)
Further reading
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Twice a day the River Thames recedes, revealing a muddy shoreline. Hobbyists known as mudlarks stroll the surface searching for objects that have found their way into the river over the centuries, everything from ancient Roman jewelry to modern...