Meaning of "bad timing" [closed]
Something that happens unexpectedly could be either pleasant or unpleasant.
If something happens with bad timing, it comes at a time when it causes the maximum distress or inconvenience. For instance, I had been waiting all summer for a date to move in to my present house. When a date was finally fixed, it was the day I was due to go on holiday! (I packed for the holiday in advance and went a day late, leaving the house to be sorted out when I got back.)