In Méxican slang, being called “mañoso”, or “de la maña” means you have ties to the Mexican gansters and narcos.
Esas personas tienen muchos bienes, deben de der mañosos / Those people had a lot of wealth. They must work for the mafia.
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I hope you have learned something new, about the spanish that real Mexicans talk on their everyday life.
If you want to improve your Spanish, I also give tutoring lessons on skype using this page that host many teachers from all over the world, and while I don’t really do grammar, I can help with conversation and doubts about the language. Also, if you are interested in any language besides spanish, there are teachers and tutors for any language there.