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1.
Something one may find extremely disgusting/grim.
Did you see what she had on the bedroom floor?? Grimmage!

That grimmage part in the film totally put me off lamb.
by ElkyElky January 05, 2008
 
2.
Slang adjective used to discribe meaty riffs from stoner/metal/doom bands, celebrating how lung-crushingly grim they are.
Electric Wizard can belt out some mighty grimmage.
by loobah February 16, 2010