A large, long-barreled, high-power handgun, preferably a revolver. From the comic book Preacher where the villain, Starr gets his junk bitten off by a trained Rottweiler and compensates with an obsession with large handguns. He stands in front of the mirror, holding his gun at groin level, saying "doom cock".
Doom cock.
DOOM COCK!
DOOOOOOM COOOOOOCK!!!!!!!!!
That .500 S&W is a fucking doom cock.
Here's where Dirty Harry pulls his doom cock.
A prattish young woman desiring to flaunt her 'gothiness,' while not really realizing how annoying and cliche she is.
"Did you hear that? Ashley just stood up on that bench and recited 'The Raven' by Poe, in that black leather skirt with the skull on it. What is she trying to do, win a doomcookie competition?"
Someone or something that bites your ankles.
To a postman, an ankle biter is often known as a dog.
To an adult, an ankle bitermay be a toddler.
To hikers, an ankle biter is sometimes a tick.
And so on.