Top Definition
When a very sweet, innocent girl feels such deep anger, that she wants to stab someone with a plastic knife. Most people with Plastic Knife Syndrome tend to say things like:
"I'm feelin' stabby!"
"PLASTIC KNIFE!!!!!"
"We were born to die."
or other depressing, violent things.
Sometimes a girl with Plastic Knife Syndrome (yes, it is usually girls only) takes a plastic knife and runs after the person whom she wishes to stab. Sometimes she even threatens her with it.

On rare occasions, the girl with Plastic Knife Syndrome DOES stab their enemy with a plastic knife. Signs that this may actually happen are:
Repeated attemps to hurt the enemy
Lots of talk about plastic knives
Constant, extreme anger
Mental issues

Sometimes, a person who is good at controlling their Plastic Knife Syndrome tends to flush food down the toilet. Though they may not admit it to anyone, they are secretly imagining the food being their enemy's head. This pleases them and reduces the urge to stab someone with a plastic knife.
Bob: Hi there, Waverly!
Waverly: PLASTIC KNIFE!!!!!!!!!!!!!!!!!
Bob: Wh-what?!
Waverly: Oh, umm, nevermind.
Bob: Waverly, are you hiding something?
Waverly: Yes. We were born to die.
Bob: Excuse me?
Waverly: Uh - nevermind!!
Bob: I think you have Plastic Knife Syndrome.
Waverly: Really?
Bob: Yes. Now how about you go flush some food down the toilet? It'll make you feel better.
Waverly: Ok! Thanks for the help, Bob!
Bob: Anytime!
by K Bieber December 28, 2009

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