the.com/douche

means An insulting term for someone who's obnoxiously self-centered, rude, or arrogant — behaving as if their presence is a gift while actually making everything worse.

from From French 'douche' (shower/douche), itself from Italian 'doccia,' related to 'doccione' (water pipe), tracing back to Latin 'ductio' (a leading or conducting, as of water). The word entered English neutrally as a medical and hygiene term for rinsing a body cavity, especially the vaginal douching products marketed through the 20th century. The slang insult emerged later — possibly through 'douchebag,' the actual rubber bag used to hold douche fluid — as the term pivoted from a literal object to an all-purpose put-down for someone unpleasant, likely because 'douchebag' just sounded like the perfect vessel for an insult: clinical, slightly gross, and impossible to say with a straight face.