Green’s Dictionary of Slang

(Aus.) of hair, having substantial volume.

1970		Aus. Woemn’s Wkly 30 Sept. 2/3: [T]here was Prue’s hair, ‘boofy’ as she called it, at least 18in. long, and thick, very noticeably blonde, and wild.
2004		J. Lambert Macquarie Aus. Sl. Dict. 24/2: boofy [...] of the hair, having lots of volume.