In gay man's terms, "The condition of 'pussying' out of meeting someone at the last minute; also known as 'flake syndrome.'" It is usually accompanied by a case of the "never hear from him again's."
Tom was supposed to meet Jake for the first time yesterday, but he came down with "Vagitis," and said that he couldn't come. Jake said it was shortly followed by the "never heard from him again's."
Employee: I’m sorry boss, I know I was due back from vacation today but I seem to have picked up a stomach bug.
Boss: Uh-huh, sounds like acute vacitis to me.