Means "tranquil" or "calm". Also referring to a person of high intelligenc who is not to be messed with. Consiquences of insulting a person of this nature include but are not limited to: ass-whooping, name calling, severe stomping and embarrassment to yourself.
Guy: What's that guys name?
Guy 2: Tranquilino
Guy: Don't make eye contact...
Guy 2: Why?
Guy: Because you're an uneducated fuck! Thats why!!