A fizzleblitz is a faster version of fizzling out (see: fizzled out) that results in a sudden termination of the fizzling process, thus terminating any future hope or redemption. Maybe you didn't know the person for very long or told them to give you a blumpkin. Maybe the kink factor was too much for them. Or the texting was going great until you sent them that text that was supposed to go to your ex and told them you only check out /r/wtf for pics of my little ponies licking each other. Regardless, whatever fizzling was happening just blitzed out of existence.
Girl: That guy who would have fizzled out on me just dropped out of existence. Friend: You shouldn't have shown him that picture of you biting a dildo Girl: oh come on, I was drunk, it was funny, and from a frat party! Friend: Maybe, but you had a chance and now he totally just fizzleblitzed your ass