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I believe that in this context DTC means direct to consumer. These sets are typically only available directly from TLG either via online orders from LEGO S@H or from LEGO retail stores. Here's the original source and discussion for the DTC set that you mentioned and several others: http://www.brickset.com/news/article/?ID=2900
A cheese slope resembles a chunk of cheese from a cheese wheel. They happen to also be the perfect size for minifigures to interact with: ‘Lego Cheese Farm’ by AIatariel, http://www.flickr.com/photos/alatariel1181/10582728886/
From the official LEGO Education site and the official EV3 FAQ: What does EV3 stand for? This is the third generation of the LEGO MINDSTORMS platform and the "EV" stands for evolution, hence EV3.
As was mentioned in another answer, the cheese slope looks like a slice of cheese at around minifigure scale. This part has also actually been used as cheese in official sets, including Medieval Market Village:
If its a "my own creation" then if one is still building it or it is still unfinished then one simply refers to it as "work in progress" or a WIP and thats how fans post photos on fansites let others know hows its is going... although i have never seen it used with offical lego sets...there are other loose terms floating about i think they where listed on ...
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