A phrase made popular by the 1989 movie 'Heathers' and the 2014 musical of the same name. It is very similar in meaning to 'Are you retarded?'.
Heather Duke: Can I be red?

Heather Chandler: Did you have a brain tumor for breakfast? I'm always red

Heather McNamara: I've been looking forward to this all day!
Heather Duke: Did you have a brain tumor for breakfast?
by ChrisWiltrout December 30, 2016
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A grandiose insult only used for the highest of offenses, it means the victim of this unspeakable offense, are a mineral consuming infant with a round physique and the facial appearance of a tumor
by PixelKat February 21, 2023
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Rumors that someone has cancer. Starts out unconfirmed and quickly escalates.
Did you hear the Tumor Mill? Steve Jobs has cancer.
by k7lty February 3, 2015
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A calcified mass in a person's intracranial space that is created from when a person jizzed a fuckton of fluids at the end of a blowjob.
Did you hear that Stacy is in the hospital? I heard that she got a flood tumor.
by eggsandpan December 1, 2018
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When a man’s cock is so fucking massive that it causes a bulge on the exterior of a females stomach when deep inside, protruding upwards creating the image of a bump and tumor
“Girl, last night.. I was watching him fuck me raw and that cock tumor, my stomach was bulging from his massive cock
by Double_savior19 August 11, 2022
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When somebody makes a really bad joke, or (even though is seems there's no such thing as) a bad pun ( :O )
Dave: "What did the fish say when he swam into a wall?
Dam."
Steve: "... Tumor Humor, Dave. Tumor Humor."
by Stephanzor February 9, 2022
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A fur tumor is when an animal gets their fur so matted up and such, -caked with mud maybe- that it literally seems like its part of the animal...
Guy 1: Woah! Did you see the vet cut off Fluffys fur tumor?

Guy 2: Yeah, biggest fur ball I ever seen!
by EmmaTheLeoaprd June 26, 2010
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