Meaning of "Write-Only"

Chatting with Joan about the blog, I realized that the term "Write-Only" may not mean the same thing to everyone. To say what it means to me, I'll quote the jargon file:

write-only code /n./ [a play on `read-only memory'] Code so arcane, complex, or ill-structured that it cannot be modified or even comprehended by anyone but its author, and possibly not even by him/her. A Bad Thing.