Similar Words to Bats:
Around The Bend
Balmy
Barmy
Batty
Bonkers
Buggy
Cracked
Crackers
Daft
Dotty
Fruity
Haywire
Kookie
Kooky
Loco
Loony
Loopy
Nuts
Nutty
Round The Bend
Wacky
Whacky
Examples:
1. You can tell her that I'm Mark's friend and I have bats in the belfry but don't ever tell her my name.
Definitions of Bats:
1. Informal or slang terms for mentally irregular