We the sixty minute group, this year finna be our year!
Our is being pronounced similarly to hour. Since 60 minutes makes up an hour, he’s playing on “our year” being “hour year”.
Also, the 60 minutes could be made up of each members' 15 minutes of fame.
To help improve the meaning of these lyrics, visit “Get Up” by Slaughterhouse Lyrics and leave a comment on the lyrics box