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1.
1. An extremely unattractive female. Particularly a slutty one that shows a lot of tits and has a high gouch factor.

2. An uggo that is a definite negative. May or may not simultaneously be a chubbo.
A: "Damn! That chick's an uggo."

B: "No. She's a nuggo."
by murkopotomus April 15, 2010
 
2.
1) A disgusting little nugget of marijuana that's hardly smoke-able.

2) Something that is really lame. Person, place, etc.
1) Ewww. Don't smoke that nugg-o, it might be laced.

2) Yo Alex, you're a straight nugg-o.
by thug-muffin-2012 February 17, 2009