Kooker, noun: a kooker is a an object of extreme affection. Not a term to be used lightly. Can be applied to a gf or a bf but only if they're unicorn-status magical creatures. A kooker always tries to do right by you. Can be shortened into "Cooky" as in The Beastie Boys' Cookypuss--"let me order one then, let me get one...anytime, just like, now, and shit."
That Dora is a real Kooker: not only did she make the end of the night beer run after the keg went dry, but she also stayed to help me clean up after everyone else went home.