Top definition
1.The Simultaneous Space docking between two women. (See Space Dock)

2.When Two women do an inverted sitting position and shit in each others pussy.
Brenda: I Want to do something different.
Butch: Lets do a cosmonaut!
Brenda: I hope you ate your fiber.

Lets Do The Cosmonaut tonight!
by Senior Pants Party November 03, 2006
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