Joking around with someone

Tomar el pelo

toh-MAR el PEH-loh — To pull someone's leg

"¿De verdad ganaste la lotería? — No, te estoy tomando el pelo."
Did you really win the lottery? — No, I'm pulling your leg.

Literally "to take someone's hair" — used for lighthearted teasing, not for serious deception.

"My brother does this to me constantly. I usually fall for it anyway."— Graciela