wacko or whacko /wakˈō/ (slang)

1. Mad
2. Eccentric

A deranged or eccentric person

• bird-louse
• bird-lover
• bird-lovers
• birdman
• birdmen
• bird-nesting
• bird of paradise
• bird-of-paradise flower
• bird of passage
• bird of prey
• bird of wonder
• bird-pepper
• birds
• bird-scarer
• bird-scarers
• birdseed
• birdseeds
• bird's-eye
• bird's-eye maple
• bird's-eye maples
• bird's-eye view
• birdsfoot
• birdsfoots
• bird's-foot trefoil
• birdsfoot trefoil