The Collaborative International Dictionary
Willywaw
Williwaw \Wil"li*waw\, Willywaw \Wil"ly*waw\, n. (Naut.)
A whirlwind, or whirlwind squall, encountered in the Straits
of Magellan.
--W. C. Russell.
Wiktionary
willywaw
n. (alternative form of williwaw English)