Mento is the folk music of Jamaica in the 50's.
Mento is a kind of Jamaican calypso, for the tourist that visited Jamaica, and you can still today find bands on hotels in Jamaica that plays mento. You can also find mento cd's and LP's. Mento is the music that became Ska and ska became reggae, (and so on), so it's pretty relevant, really.
Mento musicians: Calypsonians, Lord Fly & Dan Wiliams Orchestra, Richardson, Harold & The Ticklers, Porter, Hubert & George Moxey Quintet and Baba Motta
A shortened version of the word mental or mentally challenged. It is used as a derogatory term to state that someone is acting in a mental fashion. The root "men" deriving from the Latin meaning "to think" gives the base of the word and adding "to" that means nothing would make it" to think not at all" thus creating the word 'mento'.
person 1: Geez, do you see that person over there?
person 2: Yeah, they're sure acting like a mento.