Something that is unbelievably cringy and terrible. Commonly found on the internet, though anything that isn't born from the web but still meets the above criteria may still be referred to as cancerous.
"Wow, the Star Wars prequels are pure cancer."

"Good God, Youtube comment sections are rife with cancer."
by ToatitosScoops December 07, 2016
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1. A horrible disease that causes tumours in certain areas
2. A horrible disease that plagues websites like YouTube, Twitch and various other websites with unfunny jokes, godawful memes and general slapstick humour ripe for kids.
Teen 1: Who do you watch on YouTube?
Teen 2: I watch a lot. You'd probably not like to hear them all!
Teen 1: I watch dank meme compilations, leafyishere, dramaalert and ricegum! Their content is awesome.
Teen 2: you listed every tumour on YouTube. Cancer retard gtf out of here dumbarse.
"I have cancer" -unfunny 2 years at my school who don't even know who the Shrimpson Boyz are.
via giphy
by Fergsu Blues August 02, 2016
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The coolest disease in the world! You can get it from EVERYTHING! American cheese, Porno, breathing, Sun light, Being alive, Sex and nonvirgin blood
Yay i'm sooo much cooler then you! I got CANCER!
by FurFur July 10, 2008
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When a female is nothing but bad for you and your soul, your only choice is to cut her out and heal the wound before she consumes you and eats away at your goodness!
Dude Johnny get away from her she is cancer to your soul.
by Johnnyg724 May 13, 2016
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