The act of running over another whilst simultaneously excreting upon them. The New York napalm can be improved if the runner has spicy faecal matter, for example having a spicy curry the night before.
"Elaine got a right good New York napalm,you can really tell she has a rash on her chest. Must have been matts vindaloo"
"Dude I know she's wearing a really low top. You can tell what's happened"