a unfortunate occurrence of two or more events at one time apparently by mere chance
Also known as an Epic Fail.
When a person tries inform someone of the definition of the word "Toodle pip" using Urban Dictionary and doesn't realize that there are two definitions. One being to say goodbye and the other to tell someone they have a cute baby. This is only an Unfortunite Coincidence because both parties just found out she was pregnant and has no plans to keep the baby. "Hmm....what an uncomfortably ironic unfortunate coincidence"