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2.
Something you can actually give to your OWN definition on Urban Dictionary!! I tried it.
My positive definition of George W. Bush isn't going so well. It has 300 thumbs down and only one thumb up, and that was mine.
by HeavyD2 December 30, 2008
 
1.
1. Verb - to make somebody feel good by clicking the thumb up icon on urbandictionary.com next to a word they have placed there.

2. Noun - a physical inication from another human that something useful and worthwhile has been achieved
1. Yes - somebody thumb up my word at last!

2. She gave me a thumb up for my birthday.
by chris firth September 16, 2006