Idiom	Literally	Meaning
hablar por los codos	to talk through your elbows	to talk nonstop
no tener pelos en la lengua	to have no hairs on your tongue	to speak your mind
estar en las nubes	to be in the clouds	to be daydreaming
estar como una cabra	to be like a goat	to be completely mad
tomar el pelo (a alguien)	to take someone's hair	to pull someone's leg
marear la perdiz	to make the partridge dizzy	to go round in circles, to stall
echar leña al fuego	to throw wood on the fire	to add fuel to the fire

Estar como una cabra is affectionate teasing, not a diagnosis: Mi abuela está como una cabra: ¡se ha apuntado a clases de salsa! — My gran is completely mad: she's signed up for salsa classes!