arsehole
n.a very rude and offensive word for a person's bottom. It is also used to describe someone who is being very annoying or rude.
n.a highly offensive term for the human anus. When applied to a person, it describes someone perceived as rude, arrogant, or unpleasant.
“He is such an arsehole that no one wants to work with him.”
“The manager was a total arsehole, constantly yelling at the staff for minor mistakes.”
“While the protagonist is technically a criminal, his charm and self-awareness prevent him from being a total arsehole in the eyes of the audience.”
“It’s the antidote (and all the ammunition) we need to those arseholes who forget that Britain was great before they were born – we can see right through them.”
From Middle English arce-hoole, equivalent to arse + hole. Compare Old English ears-þyrel (“anus”, literally “arse-hole”).
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.