Bad habits...we all have them, and at some point we're going to have to fess up to them.
That's where the phrase "tener la maña de..." comes in.
A maña is a bad habit. A person with a lot of bad habits is a mañoso or mañosa.
OK, time to learn how to make those confessions...
Tengo la maña de morderme las uñas - I have a bad habit of biting my nails.
Tengo la maña de moverla pierna - I have a bad habit of shaking my leg.
There you go! Turns out talking about bad habits in Spanish is just as easy as picking them up.
¡Hasta la próxima!