1. "Keys" stands for kilos, as in "kilos of cocaine"
  2. Birds or chickens are packages or cocaine flown abroad or domestically. "Sending birds south" etc.
  3. Bricks? Cocaine again. A kilo again, I think.
  4. "Main bitch" is your girlfriend but you cheat on her.
  5. "Bottom bitch" is similar but more derogatory with language based in prostitution
  6. Anything Pusha T talks about is cocaine
  7. Cooking is about cooking crack. Any oblique references like a microwave should be connected to that.
  8. More as I think of them