look up any word, like dirty sanchez:
 
1.
A situation in which one is feeling great, not illegally induced, but more of a blissful and innocent happiness.
Hey girl, whats up, how was your day?
It was great thanks, got an A on my Bio exam- I'm on the moon.

Hey man, I'm on the moon.
Are you high?
No bitch, its a blissful happiness
by Thereeeees February 24, 2010
 
2.
high as a fuck.
damn homie, i'm on the moon!
by Austin March 06, 2004
 
3.
A term you use to let someone know you don't want to hang wit dem.
#1 Yo homey wanna smoke some weezie.
#2 No B Iam busy
#1 Doin what
#2 Playin Ball
#1 Where
#2 On the moon bitch.
by GAW February 28, 2005