Nick Fury’s iconic deleted line is: “Nick Fury, motherf***er.”

In the alternate Iron Man post-credits scene, he says it right after Tony Stark asks who he is, and it became the memorable punchline of the unused take.

Context

The released version of the scene is more restrained and teases the Avengers Initiative, while the deleted version leans into Fury’s tougher, more profane persona.

TL;DR

The deleted line people usually mean is “Nick Fury, motherf er.”*