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1.
The act of getting so high your out of this world.
I am going to the moon with Dr. Greenthumb during lunch. You could call me a regular astronaut.
by CrustFace Killah June 02, 2006
 
2.
What happens after consuming enough DXM (the cough-suppressant found in Robitussin and knock-offs) to induce a state of ball-tripping. Going to the Moon results in seeing things when eyes are closed, walking around like you're a dinosaur, and claiming "I'm on the Fucking moon"
After consuming a bottle of Wal-Tussin, I'll be Going to the Moon
by Dr. Rick February 04, 2009