Got reefer flowing through my body

from Wiz Khalifa (Ft. Juicy J) – Stackin (Bonus Track) Lyrics on Rap Genius

Meaning

The marijuana is in his bloodstreams, therefore he is addicted to it

Many people that smoke weed tend to hold the smoke in their lungs then release it. Since wiz is a heavy smoker, he must have already tried every single way to consume weed, and also considering that holding the smoke in your lungs is not just a popular way for weed, but cigarettes too.
Even if you try not hold the smoke in your lungs you still have high chances of weed going into parts of your body, like brain, lungs,heart, kidneys and etc…
http://www.youtube.com/watch?v=8v_GFbYSt6I If you are a fan of Wiz Khalifa’s “Day Today” on youtube, you can see how they are smoking weed all the time, especially Wiz.

Also a reference to Reefer Party, maybe..

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