Sweetheart from the Ground-Up
Sweetheart from the Ground-Up is a CWC-ism Chris uses to explain the type of woman he wants, because apparently a girlfriend isn't a sweetheart and he has to teach her how to be his "sweetheart". He apparently finds this term so clever that he uses it incessantly. He may think that it rhymes.
Although his meaning with this phrase is that he wants a gal pal who will eventually become a sweetheart,[1] to all other human beings it sounds like he wants to chain a young woman in his basement and brainwash her into loving him. To the insane scientists among us, it sounds like he wants to reanimate all of his old coffee grounds in his basement laboratory, and then, Pygmalion-like, begin a romantic relationship with them. This is one of thousands of reasons why non-inflatable women won't touch him.
It's also worth noting that he did say he was searching for a Sweetheart From The Ground-Up in several of his attraction signs. Considering the entire point of said signs is to find a girlfriend, not a regular gal-pal, his usage here conflicts with his given definition of the term. However, it is unlikely that he intends the phrase to have multiple meanings, but rather that he's simply too retarded to understand that a complete stranger can't be a great friend at the same time.