To "cancel" someone, or for someone to get "cancelled", means that a large group of 14 year old ariana grande stans form together and choose to involve themselves in your business, ruining your life for something you did 4 years ago, or cyberbullying you until you apologize to them personally even though they were not involved in the situation. People tend to cancel other people for minor infractions, yet those same people approve of and encourage the actions of much worse people"
If you click Cancel for the purpose of correcting a typo, UrbanDictionary.com will insist that you correct both the Definition and the Example, regardless of the fact that one of them doesn't have a typo in it. Otherwise, it will say, That example was already submitted for... even though you canceled that submission.
A stupid phrase people on the internet use to say that they want someone or something to stop doing what they do.
Most of the time, this is ineffective and just makes you look whiny