Mouth ulcer. Basically just a small open wound in your mouth that hurts like hell.
by Bobby De Niro October 31, 2005
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A canker sore is a sore on the inside of your mouth that you typically can't ignore, It suck ass
Lisa's a total slut no wonder she ended up with a canker sore.
by shanedashiz July 30, 2010
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We were having the greatest night of our lives until those 2 canker sores showed up and they wouldn't leave. It always takes too long for a canker sore to go away.
by g_lo_t December 14, 2013
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A sore one gets when he forgets to wipe his anus and then precedes to participate in athletic activities. The sore is generally very rashed and dirty. While the only cure being human saliva, one must physically eat his own Kentucky Canker sore out of his asshole or ask a friend/relative for assistance.
When Fred couldn't bare his "Kentucky Canker Sore" anymore he just decided to call up his buddy Tim.
by AJ&KEVIN November 5, 2010
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