moon landing
When one person is trying to get around another whose facing the opposite direction and, thus, cannot see the first person trying to squeeze by without touching. At the last second, as the first person is about to pass, the second steps directly in his or her path, resulting in inadvertent crotch-to-ass contact.
Example:
After an unintentional moon landing, the first person might say: "Oops! Pardon me! Didn't mean to land on your moon."
After an unintentional moon landing, the first person might say: "Oops! Pardon me! Didn't mean to land on your moon."