This word was created from a tico slang called Malespín. The costarican
army, in the middle of the
war with Nicaragua, found that the military orders were intercepted by the "nica" spies. The general Malespín proposed that the letter A was changed by E, the I by O, M to P and T to B.
So Tuanis is the code word from "Buenos" (good, great) in Malespín.
Also "Malos" (
bad, evil) is Pelis or
Work ("Trabajo") is "Brete" ("Breteji", actually. We drop the last two letters with the time).