1. Small, sugarcoated candies, mass produced and formed to resemble the shape of a bean.
2. A euphemism for marijuana, ganja, weed, useful for talking about the purchase and/or smoking of it around others or on the phone.
James: Yo nigga, I need the hook up on some errr... jellybeans.
Franklin: What quantity of jellybeans will you be requiring today, G?
James: An eighth should do me... of jellybeans.