Green’s Dictionary of Slang

daks n.

also dacks
[the proprietary name for a make of clothes, esp. men’s trousers with a self-supporting waistband, patented by the London clothiers Simpson’s in 1933; supposedly an elision of dad’s slacks]

(orig. Aus.) trousers.

[Aus]B. Humphries Barry McKenzie [comic strip] in Complete Barry McKenzie (1988) 44: When the fellers get a real skinful of the chilled article they drop the daks and yell the magic word.
[Aus]J. Clanchy Lie of Land 227: ‘Well, drop the old daks.’ ‘Old daks?’ ‘Best have a look. [...] You could knock around for years and never catch a dose or get it on your first throw.’.
[Aus]Penguin Bk of More Aus. Jokes 452: If I take me belt off, me daks’ll fall down.
[Aus]Bug (Aus.) 14 May [Internet] Atlas and Zeus – apropos no particular reason – decided to drop their dacks.
[UK]N. Barlay Crumple Zone 55: B, sitting there, daks round his ankles.
[Ire]P. Howard PS, I Scored the Bridesmaids 193: You’ve pissed your dacks.
[Aus]L. Redhead Peepshow [ebook] We sat in my lounge room in our PJs. Mine were a pair of old trackie daks and a singlet.
[Aus]me-stepmums-too-fuckin-hot-mate at [Internet] Five bucks says you were gonna take me dacks and give yourself a wristy with them.
Facebook 15 July [Internet] It was right next to the watering hole where old mate shit his daks when this daggy, yobbo bugger came at him with an axe. No dramas tonight but, and I lit up a durry, thought about my hard yakka and headed to the dunny.