An acronym for 'Didn't Ask For Your Life Story". Can also be used as a verb. Initially started as a joke at work between a bunch of auditors for whenever someone goes on a rant about something, a simple 'dafyls' should usually shut them up.
Man, I just asked her for the time and she dafyls'd me.
Friend: How did the word Dafyls originate?
Hubert: Well, it all started at work, where this one time...