They are considered a delicacy amongst monkeys, and many legends surround them. One such legend suggests that they are the thing that gave monkeys their superior intelligence, another suggests that they are the food of choice of the Monkey Gods.
When pronounced, Tchiki sounds like cheeky, so these could be pronounced as 'cheeky monkey nuts'. This analogy is further supported by the Examine text, which could also be pronounced as "Like monkey nuts only cheekier".
When eaten, the game's text reads, "You eat the Tchiki monkey nuts. They taste nutty."