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 7, 2016
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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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You are an amazing person that puts others before yourself. You are very encouraging and you don't give a fuck about what other people say 'bout you. You like yourself just the way your are!
If your a cancer, your a really lucky person

If you have a friend that's a cancer, you better keep that friend, 'cause they'll do some crazy shit for, just to make you happy
by I'm so bored December 3, 2019
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Cancer is sign! And if you see a Cancer then you defenatially should keep them because they are really nice and caring and they protect their friends no matter what.But sometimed they can be kinda mean and cry over little thing.
OMG is that a Cancer??
Yes!And dont mess with their friends because you will end up bloody!
by kana1234 December 17, 2020
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a very effecient way to kill of a character in a movie or book.
Example used, "The Kissing Booth" Killing off Ellies mom with said "Cancer"
by RealNiggaAndar May 31, 2018
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