A ledge or shelf-like projection, or in skateboarding slang, a small ramp or feature you can jump on.
Origin uncertain; possibly from dialectal English or Scots. In modern usage, particularly in skateboarding and BMX communities, it became slang for a small ledge or obstacle to perform tricks on.
'Bink' shows how sports subcultures create their own languages: skateboarders needed a word for that small ledge that's too high to ollie over but perfect for a trick, so bink filled the gap!
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