wacko or whacko /wakˈō/ (slang)

1. Mad
2. Eccentric

A deranged or eccentric person

• singing master
• singing masters
• singing-men
• singings
• singing sand
• singing sands
• singing telegram
• singing telegrams
• single
• single-acting
• single-action
• single blessedness
• single-blind
• single bond
• single bonds
• single-breasted
• single-cell protein
• single-cell proteins
• single-chamber
• single combat
• single cream
• single creams
• single-cross
• single-crosses
• single currency