To repeatedly thrust one's genitalia in a sexual manner into a space free of inanimate objects or living things; to hump without a designated target. The space hump is often used as a sign of personal victory, or is a result of extreme inebriation. The space hump can be performed from the traditional standing position, or by lying on one's back and thrusting towards the sky. Additional credit for style is added when done from an elevated position, such as atop a piece of furniture.
- When Bobby won the chess tournament, he jumped up on the table and celebrated with a space hump.
- I could tell John had been drinking, as he was standing on the couch shouting "Get these balls" and doing the space hump.