1. A Pokemon
2. A slang term for someone with an uncircumcised penis. The foreskin of the uncut penis resembles the mouth of Bellsprout and Bellsprout's head resembles the head of a penis.
Girl: I finally had sex with Juan last night for the first time.
Friend: Damn girl! How was it? What was his penis like?
Girl: It was actually kinda weird looking. He had a Bellsprout!!