1. The hopeless sense that one feels when his/her expectations have been defied.*
*Also, in some instances, this can be applied to the feeling that one gets when a lecture seems to be over but isn't.
2. "She's a man? I just thought she had a deep voice! I just got felandoed!"
3. "A death so sudden, she was doing so well. It is a shame that the local pit bull was faster than she. FELANDOED!"