Batty/ˈbæti/ Definition 1 of 2Pro Tip 1/3Slightly Eccentric Used to describe someone's quirky or unusual behavior in a kindhearted way. Gran's been collecting stray cats again, she's a bit batty. Pro Tip 2/3Not Insulting While it implies oddness, 'batty' is not typically used as a harsh criticism. Uncle Joe's dance moves are so batty, everyone loves them. Pro Tip 3/3Colloquial Charm 'Batty' carries a playful tone more suited for casual conversations. You're acting batty today, did you have extra sugar?