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1.
A literal abbreviation of 'cat rimming'.

To rim a cat.
"Dude, that isn't a cold sore. Jason's been crimming Felix and his moustache is full of dangleberries."
by Lieut. Tyrone Slothrop February 08, 2008
 
2.
A hack term used to describe someone who is "always there".
Poor Nick would have liked to be crimming like the rest of the group, but he SUCKS, and therefore fails over and over.
by King Steve April 08, 2003