Karate choping someone randomly in any part of the body and shouting "tumor" and after they ask why you just "tumored" them you tell them they are going to get a tumor wher you just "tumored" them.
Alex karate chops Will in the arm. Will says "what the hell was that?"

Alex replies " I just "tumored" you!"

Will replies "what does that mean?"

Alex says "your going to get a tumor on your arm
now"

Will replies though his tears " I don't want a tumor !"

True story.
by Alex Hof January 22, 2008
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 19, 2005
a clingy person; shadow
we'd go to the club if you could get rid of that tumor of a girl
by nappyafrochik April 06, 2003
A general exclamation of emotion. Accompanied by the word "squeal" for more emphasis.
I just got a PlayStation 2? Tumor! Tumor squeal!
by Hand Hanzo December 21, 2004
A ugly boy that you can't get rid of without surgery or you could just kill yourself. You know who you are. The annoying one in the party that you don't like but you don't want to be mean to. And he is a pervert to little boys and WILL touch you in inappropriate places
Eww look at the Tumor

Tumor
Run away its the Tumor
by AssassinCNB May 13, 2016
Tumor is a that person that's is realy annoying that is typically fat. It takes children and grows on you and won't go away
EWWWW ITS TUMOR RUN
by THE TUMOR HUNTER May 13, 2016
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