Hmm... Context is pretty important on this one, so I'll just make a potential scenario up for you. "Need a little treat for the gang" could be : Often times fathers will call their children their "gang" and the treat could be ice cream. So perhaps the expression you heard was from a father saying that he needs to get a treat for his kids. Something to win her affections back : The context would be that a man has messed up his relationship with his girlfriend so he needs to do something to get her back. That something could be buying flowers or dinner.