A person between 18 and 21 from Las Vegas. They’re adults but can’t do much of anything on the strip.
Guy: Hey should we invite your brother to go to the casino with us?

Girl: No he’s only 19.
Guy: oh so he’s a dune baboon.
by jadesparkle5 March 13, 2021
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The hamadryas baboon, a species of baboon from the Old World monkey family native to the Horn of Africa.
Person 1: Today in biology we learned about different monkeys including the Hamadryas Baboon.
Person 2: Ahh yes, the dune baboon. Did you know that this type of monkey was known to be sacred in Ancient Egypt?
Person: That’s so cool!
by lotrfan1986 March 13, 2021
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