General terms:
* Catchphrase: This is a good general term for a memorable phrase, often associated with a particular person or character.
* Quote: This is a general term for any line spoken in a movie or other work.
* Line: This is the most basic term, simply referring to a spoken phrase in a movie.
More specific terms:
* Iconic line: This emphasizes the cultural significance and memorability of the line.
* Cliché: This term implies that the line is overused and predictable, though it might still be recognizable and popular.
* One-liner: This refers specifically to a short, witty remark, often delivered by a comedic character.
* Tagline: This refers to a short, memorable phrase used in advertising or marketing for a movie.
For "Killing me Smalls," you might call it a catchphrase or an iconic line, depending on the context.
Ultimately, the best word to use will depend on the specific situation and the meaning you want to convey.