The correct term is cute, always with a tilde. In Colombia it means beautiful, beautiful or also pleasant, funny. Seperlative of monkey, which means the same thing: beautiful, cute, beautiful or pleasant, funny.
It must be a cute mistake ("superlative of monkey as an adjective") .
monísimo : Word esdrújula that carries accentuation in the antepenultimate syllable, refers to monkey or monería in superlative degree, which is very funny, very pleasant or funny