Top Definition
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
1 more definition
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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