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The act of performing the sexual position Doggy Style, but in either zero gravity or on the moon.

This position take's a lot of concentration and a good grip, as in zero gravity 1 thrust could make your partner go flying.
Guy #1 - Hey! So me and your mom last night did The Moondoggy.

Guy #2 - Oh yeah? Well my mom died from cancer.

Guy #1 - Oh, that's right. I meant your sister then.
by Phatalz June 21, 2012