A preciseley descriptive word used to describe someone who has a sudden creative but rather quirky streak or stream of thoughts come upon them out of the blue.
Can also be used as a noun to describe somone who is constantly and/or naturally "quirky" but always creative in an extremely talented and perhaps even genius and unique fashion.
"Dang that was a good idea dude! You are so peppers today!"
"Hey Peppers what have you invented lately?"