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1.
Someone who has yellow kernels of shit on their dong as the result of shoving their penis into the ass of someone who had previously eaten corn.
Jen must have gone to the BBQ because when Kevin pulled his cock out of her ass he had corn-rim.
by JDubb July 20, 2003
 
2.
the rim of your sphincter muscle used for pinching off dangling turds during deffication
i got toylet paper caught on my cornrim

also known as a dingle berry catcher
by nicholas guidry February 23, 2009