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A painful white, or sometimes red bump in your mouth. You might get them on the inside of your lips, the inside of your cheeks, or anywhere in your gums. They're normally caused by putting something dirty in your mouth, such as keys, or simply putting money in your mouth (nickles, quaters, dimes etc.) or even not washing your fruits! These things usally last for 1 or 2 weeks. It heals better if you don't put any treatment on it. But try advil to reduce the pain.
Oh damn, i shouldnt've eaten that un-washed apple! I think i got a canker.
canker by charlotte45 December 31, 2006
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a dried hard compacted snot ball from your nose
put my finger up my nose and pulled out a canker
canker by Crowtatt June 11, 2006
Sore caused by herpes or infected shaving bump.
Damn get a load of that canker on his lip!

Hey, don't go down tonight, hon...I have a big nasty canker on my puss.
canker by nixontrix November 5, 2005

canker sore 

Mouth ulcer. Basically just a small open wound in your mouth that hurts like hell.
canker sore by Bobby De Niro October 30, 2005

Canker Beast 

a fellatious woman. an term meant to be used behind someone's back
Damn! Lexie's a total Canker Beast. I can see the VD falling out of her mouth
Canker Beast by Jay-Rome April 25, 2006

Canker sore 

The most painful fucking thing your mouth can ever experience
Canker sore by WILODR July 2, 2021

canker blossom 

An STD infested slut, a thief of love and innocence.
That canker blossom gave me the scratchies.
canker blossom by SubmitNow January 4, 2012