In the film, Red Rocket (2021), the phrase “red rocket” was not mentioned in the dialogue nor were there any literal references to a red rocket. I'm not sure what it means or what it refers to in the context of the film.
Wiktionary gives the definition for "red rocket" as "US slang for the erect penis of a dog, wolf, etc." This meaning was also not referred to in the film, nor mentioned in the dialogue.
Who or what is being referred to by "Red Rocket"? What is the film title's significance or symbolism?