Describing someone a little wild

Estar como una cabra

es-TAR KOH-moh OO-nah KAH-brah — To be a bit crazy (in a fun way)

"Mi tío está como una cabra, siempre haciendo locuras."
My uncle is a bit crazy, always doing wild things.

Literally "to be like a goat" — almost always affectionate, describing someone eccentric or fun rather than genuinely unstable.

"An extremely accurate description of most of my closest friends, said with total affection."— Graciela