Designated God Damn Sweetheart. Someone who is kind to the people in their life and does nice things for people who treat them well. Whether it's just saying 'hello' with a smile or getting the person a nice gift, this person makes sure they give back.
"Oh, he's a DGDS. Totally your type."
"I just want to give congratulations to Dylan, an absolute DGDS."
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.