New startup sells coffee through SSH: SSH stands for Secure Shell, which is a network protocol that allows for secure communication between two computers. In this context, the joke suggests that this new startup is selling coffee through a secure connection, presumably online.
Is it /usr/locally grown and single .'ed?: This part of the joke is a play on the directory structure in Unix-like operating systems, where /usr typically contains user-related programs and data. "Locally grown" suggests that the coffee is sourced locally, and "single .'ed" is a wordplay on "single origin," a term used in coffee culture to denote coffee that comes from a single geographic origin. The /usr/locally grown part humorously combines Unix directory structure with the concept of coffee sourcing.
How quickly can they mv it to my ~?: Here, "mv" is a command in Unix systems used to move files or directories, and "~" represents the user's home directory. So, "mv it to my ~" is a playful way of asking how quickly they can deliver the coffee to the customer's home. It's also a pun on the idea of moving the coffee to the user's home directory.