fluking
n.— «The whale had a slightly smaller companion, and while both creatures obliged by spouting repeatedly and showing off their smooth grey-blue backs (in spite of their size, blue whales are surprisingly slim and tapered), the acrobatics were definitely over. However, each was more than happy to show off its tail as it dove deep into the water. In whale speak, this is known as “fluking.”» —“Whales visit L.B. coast” by A.K. Whitney Press-Telegram (Long Beach, California) July 23, 2007. (source: Double-Tongued Dictionary)
Further reading
You know when a cat’s tail goes straight up and appears to vibrate? Emily from Coventry, Rhode Island, says her family has their own word for that: fribbling. She says her family also made up the word bomple to denote the action of fruit...
To joner means to “bring bad luck to” or “jinx.” This term is a corruption of the name Jonah, the biblical figure who initially resisted a divine command. His presence on board a ship supposedly caused a great storm at sea...