"sweet sam houston" what does this mean? I got this line from big bang theory, the most recent episode. Sheldon said: Well, I believe I've done it. And I'm only saying "Believe" To sound modest, because, sweet Sam Houston, I did it. about this "sweet sam houston". I'm thinking it's pretty much the same as "oh, boy; jesus" stuff like that, Am I right? Is there more to this phrase? Thanks