The joke, told by RK, goes something along the lines of this:
A young Native American boy looks to his father and asks how he and his siblings got their names. His father responds, “each time your mother gave birth, I walked out of the yurt. The first thing I saw became each of your names. This is how Eagle Flies High got his name, and how your sister Sunrise Dawn got hers too.” The boy thanks his father, and his father says, “no problem, Two Dogs Fucking.”
This joke was taken from a good friend of RK in his childhood (70-80s), and he believes it was also from a movie from around the time, but from which one RK can’t remember. The setup of the joke, while long, is the part with the most embellishment during the telling, often with short asides about how the father looked upon a brilliant sunrise or the majesty of the Eagle passing overhead. The punchline about the two dogs fucking is said almost as an afterthought, adding to the ridiculous name by talking about it as if it were, say, “John”. The joke was so funny to RK and his friends that one of his best friend’s nickname while in Indian Scouts growing up was “2 dogs” in reference to this joke.
This very crude joke is a product of RK’s childhood, and he remembers it fondly because of the memories it brought up. Aside from simply being funny, it became an inside joke amongst their friends, making it a signifier of their friendship long after the first time it was said. The joke was so influential that it inspired a nickname for one of RK’s friends, making it a critical part of their time growing up. The joke itself relies on a stereotype that Native American names are often translated into English as pieces from nature, compared to the more traditional European-style names that are common in the United States, allowing the first two names to seem reasonable. RK grew up in a decently wealthy Chicago suburb that was mostly white, so the relationship to any Native American people or culture is in the medium to allow the names to exist. However, the use of Native American people in general isn’t necessarily needed, making their addition to this joke perpetuate stereotypes that Native American people lack the refinement and common sense of the “normal” American person. More recently jokes that follow this same or similar structure drop the usage of Native American people at all, instead using a nondescript parent/child where children were named after things their parents loved, like how one’s mother loved roses and named their child “Rose”, with the other child “Lightsaber” coming from their father’s love of Star Wars. This readaptation of the joke maintains the same humor setup without having to draw upon making fun of the culture of Native American people.