Cancer of the bum. Otherwise known as Colon cancer, or in general cases, any bum related injury. Piercing a bum cancer tumour can lead to potentially fatal bum AIDS.
Katie: I think I have bum cancer. My ass is bleeding.
Me: You do not have the bum cancer, you ass.

Katie: I hurt my ass:(
Me: What's that I hear? BUM CANCER?! You have bum cancer?! Ergh.
by Kirstylovesthebum January 12, 2008
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A way of upsetting 13-16 year old females (mainly) by calling their new favourite "new" band My Chemical Romance overatted, shit etc

Even though its a shitty little insult it caught on round here and really hits hard to some.

Really witty person:"so what bands do you like?"
MCR hag: " I heart My Chemical Romance"
RWP: "you what??? My Chemical BUM cancer??" (be sure to give "bum" more emphasis)
MCR hag: "shurrup, Gerard Way is well hot"
RWP: "FOOL!"
by hair removal cream August 8, 2006
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