Guy: So whatd you have for dessert yesterday?
Girl: Oh, just some coockies
Guy: Oof, you luck af. Can I has some?
Girl:How darest thou ask such of me?!? I shall smit thee with my coockieness!
damn coockie crumb means something like "fucking asshole" only than in a more stupid way. insulting someone with that he's nothing more a coockie crumb to you.
person one: kicks person 2
person two: ah that's hurts you damn coockie crumb!!!