While taking a dump, a person simply produces just one big long piece of shit that amazes the human eye. Although, this will be the only piece of shit you're able to get out during your entire bathroom session, the joy that comes with it is immeasurable. Common feelings include deep satisfaction, amazement, relief, and a well sense of being.
"I felt like my ass was gonna explode after all those tacos we ate man! But, instead I just had a one shit wonder! The thing had to be a good foot and a half long. So satisfying. So soothing"
If you don't get your shit in one sock, you are never going to get that project done on time.
This term originated in the US Navy, and a "sock" is a term for seabag. A sailor who was not organized would not be able to put all of his belongings in one bag to be ready for quick deployment. Hence, the need to "get your shit in one sock".
After watching someone perform a task really well, you might say "Wow, that guy really has his shit in one sock."
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.