A beaner's penis. beaners are not born with a normal penis, but a deformed one oddly shaped like a bean. Some beaners get their beanis cut off and replaced with a penis, others accept their heritage, and others eat it by mistake.
Juan: janet, why did you leave yesterday, i thought we were finally going to engage in sexual intercourse.
Janet: Sorry Juan, your beanis scared the shit outa me. Now get the fuck away from me, you fucking beaner, spic, bastard!
When she pulled her pants down I began to feel like Stephen Rea in The Crying Game. As I started to wretch she laughed and said "Don't worry, mate...you're not barking up the wrong tree here - that's just my beanis!"