Saberse (en. To know oneself)

/saˈβeɾ.se/

Slang Meanings

To know oneself well
I know it inside out, so there's no problem.
Me lo sé al dedillo, así que no hay problema.
To have insider information
I know what’s going on between them, but I'm not going to say it.
Me sé lo que pasa entre ellos, pero no lo voy a decir.