the.com/bugger

means A rude-ish British word that can mean a person (annoying or lovable), an expression of frustration or surprise, or a verb for sodomy, with meaning decided almost entirely by tone and context.

from Traces back to 'Bulgarus,' medieval Latin for 'Bulgarian,' via French 'bougre.' The link is religious hatred: Bulgaria was home to the Bogomils, a heretical Christian sect, and medieval Europeans smeared heretics generally with accusations of deviant sex — so 'Bulgarian' curdled into a slur for heretics and sodomites alike. English picked up 'bugger' in that sodomy sense, and over centuries it drifted sideways into a general-purpose curse, losing most speakers' awareness of the word's grim theological origins entirely.