Borrowed from Afrikaans doos, from Dutch doos, of Germanic origin. Related to douche.
From Dutch doos (“box, vagina, stupid female”), from Middle Dutch dose.
doos (plural dose, diminutive dosie)
From Middle Dutch dose (since 1361), probably from Latin dosis (“the small box in which a dose of medication was given”).
doos f (plural dozen, diminutive doosje n)