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1.
The come-down after smoking marijuana
Shit man- i'm monging out
by Dave October 22, 2004
 
2.
Basically - Zoning out, going into a daydream like state and you can't help but do so. When your eyes become fuzzy and you love to stare at an object in front of your eyes.

It's both a natural thing that happens and can also be caused by smoking weed.
"I can't stop monging out!"
by fezkayuu November 16, 2009
 
3.
The act of being a mongoloid.
Quit monging out, SB.
by colin- September 13, 2005