From online games, deriving from "Player Killing". A PKer is one who kills other players for the enjoyment of killing them or causing them grief. See also RPK or RPKer.
Watch out for Riv when you get in Diablo, he's a known PKer.
by [LK]Myrik December 10, 2004
The abbreviation "pker" stands for "player killer" and is most commonly used in online games where players fight one another head-to-head, such as Diablo and Runescape.
In Runescape: "Watch out for pkers when you go in the wilderness!"
by Litza Karpov September 28, 2005
Symptom:
A PKer is someone who hunts less experianced players on internet videogames. PKer's are considered the murderers in the RPG universe. Usually, a PKer will target someone who is grossly lower in level then they are, if it is an RPG that is. PKers have zero remorse for who they kill, and will eliminate one or more of the same players over and over again. In the popular game, Diablo 2, PKers run rampant in hardcore. There are a few in softcore, but not as many.PKers will get more "pleasure" from killing in HC, due to how once their victim is dead; It stays dead for good. Because of this lovable trait, PKers are rarer in softcore, but still should be looked out for! Pkers will use hacks from time to time to improve their "kill rate". Lagging the game, etc.

Cure:

Usually a PKer is focused on killing weaker people then him, so it's fairly easy to dispose of one with the conventional means.(i.e killing him.)
Pkers will usually, if alone, leave the game if they are outnumbered, or see that they will lose the fight. Pkers who are also skilled fighters are difficult to find- but still exist nonetheless.
(The Pker)Lixterian: hey can i join ur party?
Bob_LOLZ: k, plz helpy us kill d thx?
Lixterian: k
*They arrive at Chaos Sanctuary*
Lixterian: brb, i got 2 repair my sheild
Bob_LOLZ: k
Lixterian has declared hostility towards you.
Bob_LoLZ was slain by Lixterian.
noob was slain by Lixterian.
cocksucker was slain by Lixterian.

cocksucker: WTF FAG FUYCK!!11 I TRUSTED U FAG
Lixterian: :)
by Ted_Bundy November 15, 2005
The person who makes tierlists for the popular roblox JoJo game called "YBA" (Your Bizarre Adventure)
Can u send me the new pker tierlist?
Oh sure, here it is.
by November 16, 2022
A fan of the Italian Disney sci-fi comic saga "PKNA - Paperinik New Adventures".
i'm a old pker, i follow PKNA by the zero numbers.
by tarkus42 January 31, 2015
One who goes for unexperienced players, players that are lower levels than him, or people that are weaker than him, in both spells and attacks.
on diablo !!, eragon. is a friggin PKer! watch out 4 his ubz0rs spells. his sorceress pwns all!1!!!1!!1
by JsRf13 March 8, 2005
09 Pker: Catastrophic failures that have the e-balls to call themselves "pk'ers," but rely on the amount of brews their pokemon can hold, and act e-tough because they sit on the computer long enough to spam click something 50,000 times a second.
Damn, you see that 09 pker? His left hand must be down his pants while his right is on the mouse!
by ILikeButter August 29, 2009