Dárselas (en. Give them to them)
/ˈdar.se.las/
Slang Meanings
To pretend to know more than one actually does.
That person acts like they know politics, but they have no idea.
Esa persona se las da de que conoce la política, pero no tiene idea.
To pretend to be better at something to impress.
At the party, he acted like a dancer, but he was very clumsy.
En la fiesta, se las daba de bailarín, pero era muy torpe.