Budgies make a variety of different noises but the squawking (or ACK ACK ACKing) is the one most complained about. While the noise certainly doesn't sound pleasant, it doesn't necessarily mean that your budgie is unhappy or angry. Most budgies will make this noise when they're excited, calling to another budgie, or just want to hear their own voice. This is almost never a behavioral issue and you should not attempt to punish your budgie. However, if your budgie seems to be making noise in order to get your attention and this bothers you, ignore it. Don't yell at your budgie or run over to cover him up. Eventually, your bird will find that making noise does not cause you to come running and he will stop.