Used in response to a put-down, turning it on the one dishing out the put-down.
Source: The Three Stooges. Has since been used in countless films and tv shows, including Clerks and Friends.
Snooty Rich Lady: "Murphy, who are those slovenly creatures at the door?"
Murphy the butler: The plumbers, Madam.
Snooty Rich Lady: Well, send them to the servant's entrance. We can't allow rifraff in the front door.
When you're about to nut but the model in the porn you jerking off reminds you of someone so you stop.
Male 1: Dude i was fapping to Piper Perri but she reminds me of Samantha so i switch to another chick Male 2: So Samantha resemblance nut block you?
Male 1: pretty much