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An abnormal growth of tissue resulting from uncontrolled, progressive multiplication of cells and serving no physiological function; a neoplasm.
<b>Doctor:</b> Well, Rudolph, we finally figured out what makes your nose red.
<b>Rudolph the Red-nosed Raindeer:</b> Is it pixie dust? Or leprechaun tails?
<b>Doctor:</b> No, it's a tumor.
<b>Rudolph:</b> You mean like a magical Christmas tumor?
<b>Doctor:</b> No, a malignant tumor... The base of which is lodged deep within your brain.
<b>Rudolph:</b> Oh. ... like a happy special-
<b>Doctor:</b> You're going to die!!
tumor by Rian April 25, 2005
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a group of cancerous cells that forms naturally in the body, like steroids
Tumors are not caused by carcinogens
tumor by PlayDohMan May 10, 2004
"It's not a TOOMAH (tumor) " - Arnold Swartzenager in 'Kindergarten Cop'
tumor by Rangiora August 14, 2010
1.) An unbelievably annoying person that is so hard to be around. No one can stand this person for more than 30 seconds.

2.)A swelling of a part of the body, generally without inflammation, caused by an abnormal growth of tissue, whether benign or malignant.
1.) "Man, Sean is being a total tumor right now."

2.)"Turns out Sean actually had a tumor, he's in the hospital now."
tumor by Quinnlandmine November 19, 2017
a cigarette, use it often by big smokers
"Let´s have a tumor!"
"Hey, Give me another tumor!
Camel or Benson? "
tumor by Luis E. July 29, 2006
More Then One
"Can I Have Tumor?"
Tumor by Alex September 13, 2003
Someone or something that inserts itself into your life and doesn't go away until you've either died or blasted it with lasers.
God, Zack is such a tumor. He just shows up and spreads his cancer everywhere.
Tumor by Mr. Pudding July 13, 2018