Beex is one of the two currencies that Woozworld uses. It is now used for the main currency of Woozworld. When Woozens do an event of 'sales' or 'rares', they sell them with beex as it is the only currency you can sell items with. (As of the new update, "Giving Beex Some Love.")
You can get Beex by leveling up or voting Woozens or Unitz. You can also get Beex by selling stuff.
Another way beex is acquired is when you use the Activity Center, it is used by selecting on the activities, click on "Start" and then, wait the amount of time for the activity you chose, then when the activity is finished, you may click on "Claim" to collect your reward.