hush your gums, made by MasTiemp01, means to shut your mouth basically. Therefore, if you for example, for an insult, someone might tell you that you don't deserve teeth so you should be able to speak, so hush your gums.
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.