hydraulic
n.— «We did what’s called surfing with the raft, surfing is basically where you put the front half of the raft in what’s called a hydraulic, or a surf hole. You can spin around in it, you just try to maintain keeping the raft in the surf hole for as long as you can. It’s really fun.» —“Outsiders: Josh Reeder & Audrey Rogers” Juneau Empire (Alaska) Oct. 15, 2006. (source: Double-Tongued Dictionary)
Further reading
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