wacko or whacko /wakˈō/ (slang)

1. Mad
2. Eccentric

A deranged or eccentric person

• backlift
• backlifts
• back-light
• back-lighting
• back-lights
• back-lill
• back-lilt
• backlist
• backlists
• back-lit
• back-load
• back-loaded
• back-loading
• back-loads
• backlog
• backlogs
• backlot
• backlots
• backmarker
• backmarkers
• backmost
• back-mutation
• back-mutations
• back number
• back numbers