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!!
by Rian April 25, 2005
a group of cancerous cells that forms naturally in the body, like steroids
Tumors are not caused by carcinogens
by PlayDohMan May 11, 2004
"It's not a TOOMAH (tumor) " - Arnold Swartzenager in 'Kindergarten Cop'
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."
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? "
by Luis E. July 29, 2006
A euphamism for one's testical(s), used by immature boys to make an unsuspecting victim look at it / them.
Hey, man, check out my tumor!
by Kisil February 20, 2005
we'd go to the club if you could get rid of that tumor of a girl
by nappyafrochik April 7, 2003