Definitionen
1.NounA jet or current of water or vapour directed upon some part of the body to benefit it medicinally; in particular, such a jet directed at the vagina for irrigation.
2.NounSomething that produces the jet or current in the previous sense, such as a syringe.
3.NounA jet or spray of any liquid.
4.NounEllipsis of douchebag (“objectionable person”).
5.VerbTo administer a douche to; to shower; to douse
6.VerbTo use a douche.