Male genitalia (Penis). Often used as a nickname with reference to someone's idiotic actions. One who acts unwisely on a given occasion and is given this appellation on judgement of their conduct.
Dean made a fool of himself last night sleeping with that hogbeast Carol. What a boaby!
Male seminal fluid (Sperm)
Paul - "Dean, have you just farted?"
Dean - "No, I just burped. Why?"
Paul - "I thought I smelt spunk!"