:cd tilde: /C-D til-d*/ vi. To go home. From the UNIX C-shell
and Korn-shell command `cd ~', which takes one to
one's `$HOME' (`cd' with no arguments happens to do the
same thing). By extension, may be used with other arguments; thus,
over an electronic chat link, `cd ~coffee' would
mean "I'm going to the coffee machine."
-- The AI Hackers Dictionary