Ducker

[PussyCat]

One who, or that which, ducks; a plunger; a diver.

[Rihanna]

Someone who commits to hangout with his friends only to duck out on them and ditch them for something way less cool.

[Raeanne Dimick]

someone that is antisocial or otherwise a pussy.

[Becky]

The(much more hurtful) combination of both [duck] and [fucker].

[Tina]

A person that repeatidly goes AFK in the middle of an instant message conversation without letting you know they are away from the computer.

[Little_Girl]

A rather large stone used as a form of primative weaponary. So named as when thrown it requires one to crouch down or as the term goes to duck.
Ducking was primarily considered the best form of defence against such attack until, as a species, we became more intelligent and in fact running is now considered much more effective. This may be for two reasons; 1.) Attackers were becoming more wise to such ducking and therefore proceeded to throw the ducker at a lower level, causing many injuries to the back of the head and back. 2.) If running is achieved at a credible pace it limits the possibility of secondary or multiple attacks. Whereas with the primary defence, ducking there was almost always potential for secondary or even multiple ensuing attacks, unless with some luck, the attacker runs out of such ammunition. In which case, usually the attacker then becomes defendee.
Thus, my opinion is that the name of this here weaponary be changed in fact to a Runner. Although I admit, it does not have quite the same ring to it, nor would it prevoke the same sense of fear when used as verbal in attack.

[Justin Bieber]

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, whats so good about Ruby?
-I dont know. I guess its just love, mate.

[Sonia]

n. Person who likes Duck Dynasty, an inexplicibly popular TV show.

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[Dave Paprocki]

replacing the word fucker in an email so as it will not be flagged in the email filter at the office