willy-willy
Concise Oxford English Dictionary © 2008 Oxford University Press:
willy-willy/ˈwɪlɪwɪli/
▶noun (pl. willy-willies) Austral. a whirlwind or dust storm.
– origin from the Aboriginal languages Yindjibarndi or Wemba-wemba.
'willy-willy' also found in these Oxford entries:

