Cause I'm rider, smoking sour

from Redman (Ft. Runt Dawg) – Zip Lock Lyrics on Rap Genius

Meaning

“Sour” is referring to Sour Diesel. Sour Diesel is a hybrid strain of cannabis. It is a cross between Mexican sativa and Chemo indica. The strain produces a fast acting, dreamy high that, due to a 90% concentration of sativa, yields excellent cerebral effects. It is best known for its extremely pungent sour scent as well as its uplifting, mood enhancing effects.
Sour Diesel is highly effective in relieving stress, anxiety, and pain, and there is some suggestion that it may be helpful in alleviating the symptoms associated with chronic depression.

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