ducker
One who rapes ducks at night. An extremely rare type of schizophrenia.
Can be used as an insult. When an insult, is extremely offensive, equivalent to the rudeness of bitch or a arse-eating twat.

-Mate, what's so good about Ruby?
-I don't know. I guess it's just love, mate.
Example 1: "Dude, I... I need to tell you something..."
"What?"
"At night I go out and ... rape... ducks"
"Holy shit dude, you're a ducker?!"
Example2: "Dude, I fucked your girlfriend"
"Oh my god, you motherfucking DUCKER!"
Example3: "2 plus 2 is... pi?"
"Dude, you're a fuckin' ducker"