A stubbornly deluded idiot, one who refuses to acknowledge their errors. Blind in the face of evidence, and prepared to make any claim that would support their argument, no matter how outlandish.
"People who disagree with my opinions threaten my children with death on a daily basis. That's how right I am."
"James, you're such a delingpole."
Pink Ninjas are stealthy, and strike without warning. They are experts at concealment, until they become overly excited. Typically 5 1/2 - 6 inches tall and with prominent veins, they are accompanied by their two faithful hairy companions.
Alternatively, another name for the penis.
The pink ninja slipped into the bushy undergrowth.