"Do Wah Diddy" is the musical precursor to two important rhythmic compounds: "Diddy Dum" and "Diddy Do".
Ingestion of these compounds and precursor typically affects users by making them walk down the street, snapping their fingers and shuffling their feet. In extreme cases, users have reported hearing wedding bells chime.
Ah ha! Does it have something to do with a ‘’boy from New York City?’’ :-)