Top Definition
marijuana, weed, pot
Hey man, let's go smoke some moon grass!

He's high on moon grass, man!
by TehRen July 08, 2015
bluegrass music played under the light of the moon, or bluegrass music played at night
Now that the moon is out, it is time to play some moongrass!
by stringpicker April 19, 2010
Weed you have stored in your ass for safe keepings, or in fear of getting busted by the cops.
"Dude, i want what your smoking"
"Are you sure? It's moon grass"
by He's the boxman September 21, 2006
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