Green’s Dictionary of Slang

crusties n.

[the asssumption of some form of fecal dirt therein]

(Aus.) male underwear.

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[Aus](con. 1964-65) B. Thorpe Sex and Thugs and Rock ’n’ Roll 201: Tony [...] had to go to the dresing room to drop his daks. No public showing of the crusties for him.