molly slap

Term used both figuratively and literally to disrespectfully slap someone in the face, with an open hand. It is often, but not necessarily, two or three quick slaps on a row.

Not unlike a "bitch slap" but used when even less regard is called for. Molly, in this instance, is referring to the term for a female cat, e.g., the way it playfully swats at things. The implication is that the person being slapped is not worthy of even a bitch slap, let alone a real punch.