It's a subtle way of reinforcing the message that Indians are different from the rest of us. And it's not as if the context is anything good. According to SNL, Snooki is as promiscuous as the Chippewa, who are so promiscuous they have a special word for sexual quickies.
The show also opened with a Wayne's World segment featuring Wayne (Mike Myers) in a Chicago Blackhawks sweatshirt--same as in The Dilemma. Really? No one thought putting a stereotypical image of an Indian "brave" on screen for five minutes might not be a great idea?
Imagine if you broadcast an image of an African spearchucker or a greedy Jew for five minutes. Does anyone think no one would notice that? For the umpteenth time, it's the same thing, people.
For more on the subject, see Kesha Goes Tribal in Saturday Night Live and Indian Curse in Saturday Night Live.