Drive-by muttering

Was walking home today when a car pulled up next to me. The driver, my neighbour, stuck his head out the window, shouted something at me, raised his middle finger and sped away.

I have absolutly no idea what he said. I find that more annoying than the action itself. You'd think if someone was going to go through all the effort of a drive-by insult, they'd at least learn to articulate.