A propagandist. Drawn from the Russian term pronounced (loosely) as "maz-guy-ope", a brain-fucker is one who tries to fool his(her) listeners with: (1) emotional rhetoric that contain few (if any) facts, (2), conspiracy theories and accusations against opponents that are not supported by evidence, (3) arguments that opponents are members of "discredited" groups (i.e. globalists, liberals, racists, etc.)
I don't listen to talk radio. Most off those guys are brain-fuckers.
A term of endearment given to an unfaithful husband who "mistakenly" fucks a slut after the slut convinces him that his wife is slutting, in order to fuck him.
A insult originations in the youth of the Waiheke community, it’s considered greatly insulting to be called a muttfucker As it’s referring to the fact that one has sexual relations with a dog.