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The scientific phenomenon behind the ratio of watermelon consumed to the darkness of one's skin; ie, the greater the amount of watermelon consumed, the blacker the skin.
Example 1:

Person 1: "Look at that guy over there, he's really enjoying that watermelon."

Person 2: "Oh, you mean that black guy? Yeah, he has a really high watermelatonin count."

Example 2:

Person 1: "I heard Tyrone was allergic to watermelon"

Person 2: "You mean Tyrone the new guy at work that's really light skinned?"

Person 1: "Yeah, he must have a really low watermelatonin count."
by Wink1 July 02, 2013
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