Hilda: "What's the story with him?"
Jim Hawking: "Ah, it's nothing. Gene's a space cherry."
—Outlaw Star, "World of Desires"

"Space Cherry"[1][2] is a derogatory term used to describe a person or persons who have never been into space or are afraid of space. The term is used much in the same way someone may describe a virgin before or after their first sexual experience.