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This is made up of five words: give a fuck, me? NOT!
And is used when somebody is trying to get your attention on a subject you don't really, ummm, give a fuck about.

Use it in similar circumstances, with emphasis on whichever syllable you want to create the right kind of impression on whoever is trying to get your attention.
Edwinus: So, are you grateful that Jesus died for your sins?
Zippy: Gafmenot, moron, gaf me fucking not.
by jim_the_lad October 22, 2010