Get Lucky

Could mean several things. You make your own meaning to the song. In my opinion this song could have several main meanings. Here are the main topics:

1. About a relationship.
2. About two people who really like/love or are attracted to each other
3. Partying with people specifically a guy and a girl or just the band
4. The band is explaining themselves how they made it from their beginning to whenever they will end

Lyrics explain all of those topics I just explained, the rest is self explanatory. No need for further explanation.