What does this mean?

[ECO]

The blacker the berry the sweeter the juice

<---I found this saying over at facebook and without jumping to conclusions I would like to know what "juice' is referring to.

[Wahoo]

Famous quote from the movie Friday:

Smokey: The older the berry, the sweeter the juice.

Craig: Man, it's the blacker the berry, the sweeter the juice.

Smokey: Yeah, well she blacker than a MF'er too.

[MZKUMA]

It is usually referring to a dark skin person. More ripe, better to you. Sometimes a defense reply when one makes a comment on a individuals skin color/race (mainly a black person). Or a preference of an individual. It rarely has anything to do with a fruit.