Top definition
Slow of mind, lacking interest or point. Lacking common knowledge. Possibly a victim of brain damage.

See STUPID,MORON,IDIOT,OBTUSE
"YO SHANEQUIA, Isn't that girl so mo0sy!?"
by Jadyyn Gangrape March 20, 2005
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2
Comes from the latin words moooretarded, and syyyisdumb, which means to be dumb. see stupid.
psh, Becky, don't pull a mo0sy, now.
by le raerae. March 21, 2005
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3
One or something that seems brilliant, in style, and considered vogue to peers
WOAH! That's SO mo0sy!!!
by Farrah March 21, 2005
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