When used in an intelligent context, stands for "Deep Thinking Club," a state of mind and style of life during which one philosophizes with friends either online or in real life about a wide range of topics, whether in the brainy realms of politics and the reason for existence or in the heartfelt throes of theocracy and especially romance.
Ted: Hey guys, I've been having this one weird dream over and over again.
Jeremy: Is it the one about popcorn?
Ted: Yeah. I wonder what it means.
Nick: What we really need to ponder is not what YOUR dream means, but perhaps what the ESSENCE of a dream means?
Mike: I sense a DTC coming up.
Ted: DTC at my house.