Short for 'Willis,' a name; in Australian slang, a playful or mischievous person; or an old truck or vehicle in some contexts.
Primarily a given name from Germanic 'will' meaning 'desire' or 'will.' Regional slang uses vary by location, with 'willi' sometimes being Australian or British informal usage for a character type.
In Australian slang, 'having the willies' (nervousness) and a 'willi' (mischievous person) might share psychological roots—both relate to unpredictable, twitchy behavior or people who make others uncomfortable.
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