From bat + -y. In sense “insane”, attested 1903, from expression have bats in one's belfry, from tendency of bats to fly around erratically. Compare also batshit (“insane”) and squirrelly (“jumpy, eccentric”).
Mellora a túa pronuncia
Practica a expresión oral e a memorización de " batty " e moitas outras palabras e frases inglés .