Its when you give a thumbs-up to a word on urban dictionary.

1. Game played in the classroom.

2. Describes the posture of people sending SMS's, tweets, emails, facebook status, ebay, blogs etc.

3. A good way to miss your turn-off, walk into someone or have a crash

A term youtube users will submit in the comment section of a video of any song that is older than a year to let everybody know that because they listen to older music, they are special. As a result, people who feel the same give them thumbs up as was the original intention of the comment.

A way to express some down under love.

The way you do it, is you point both of your thumbs down, then slowly point them out and shout "TWO DOWN UNDER....THUMBS UP!"

Only Ozzy's will (most likely) get this joke.

When someone puts two thumbs up someones anus along with their penis and preforms anal sex.

To encourage and otherwise exhort a fellow user of the UD to give a "thumbs up" to a word you have just defined/submitted to UD. Being thumbed up can really be a very pleasurable experience, it is said.

A saying, usually said at the end of a movie or performance, that basically means that you liked it a little bit, but it wasn't perfect.