Scrooge mumble

(Noun) An indistinct utterance used in public places to repel people asking for money. Delivered in a polite and apologetic tone, but without eye contact or any intelligible words that could be used as the basis for a conversation.

A homeless guy hit me up just as I got to the front door of the restaurant, but I warded him off with a Scrooge mumble and ducked inside safely, wallet intact.