I don't think I've ever been what I would truly consider blackout drunk. There was one day around New Year's 4 or 5 years ago where I was mixing drinks that consisted of white rum, vodka, gin, triple sec, sweet & sour mix or Sprite, and a bit of blueberry liqueur and raspberry liqueur. I successfully managed to wipe out the memories of my rommate and another friend for most of the day. We started drinking at my house around 12pm, and continued until after midnight.
I do remember cooking dinner, feeding everyone, and watching Iron Man as a group sometime late in the afternoon. Then the only thing I remember after that was trying to watch Macross Frontier at 1am or 2am and trying to keep one of my friends awake, but failing. I was functional for most of the day, but pretty drunk.