The combination of the phrases why and how come usually in connection with a question about anything.
Sue: We have to go to that thing tonight.
Bob: Why come?
Sue: Did you just say why come?
Bob: Yeah, why come?
Sue: Sigh
Bob: Why come?
Sue: Did you just say why come?
Bob: Yeah, why come?
Sue: Sigh
by Rich N. Kreemy January 07, 2008