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1.
Sen. Bill Frist, Tennessee Republican.
So named because when he was a med student, he lied to local no-kill animal shelters by "adopting" kittens, keeping them as pets for a few days, and then dissecting and killing the cats for his medical experiments.
First Senator Cat Killer tried to use the nuclear option to enable Bush to ram through extremist judges. Now he wants to run for president.

Americans ought to go all out to keep Cat Killer from becoming the next President.
by Stop the Pendulum July 02, 2005
 
2.
A person who is too curious for their own good. Derived from the phrase "Curiosity killed the cat."
A: "Aren't you curious to know why John and his girlfriend broke up? You should try to ask him."

B: "Hey, I'm no cat killer."
by Paylardo January 30, 2011
 
3.
A word use to insult or discribe someone that is a lover of cats and that you would like to get on their nerves by saying you would like to use sexual or violent preferences to their cat. (see also pussy).
Jimmy: Hi whats up?
Seamore: Hows your cat?
Jimmy: Hes fine... Why do you ask?
Seamore: wheres he at right now?
Jimmy: In the house, I think.
Seamore: Are you sure? (wink)
Jimmy: Wait are you hurting my cat in any way?
Seamore: Maybe? (wink)
Jimmy: ahhh You catkiller.
Seamore: Maybe?
Seamore: Are you kidding i Wrecked that pussy!
by Alex Rhodelander April 22, 2008
 
4.
v. Someone who masturbates.

Derived from popular image of kitten jumping through meadow. "Everytime you masturbate, god kills a kitten -- Think of the kittens"
"Katelyn killed a cat last night"
by wen March 08, 2005