Short version of "All Done" -- used like STFU when you want to end the discussion immediately... sometimes accompanied by your palm up in the person's face.
Emily (going on and on): "I don't know. I mean I totally like him but he doesn't seem to notice me, and I'm trying everything to get his attention, but he still ignores me and I'm so stressed... Ya know what I mean?"
Friend: "Em, seriously, ALL D..."