(slang) Synonym of idiot: someone who is foolish or stupid.
adjective
(slang, possibly offensive) Synonym of crazy.
He told the businessmen that the law that required the certification by the President was ‘tonto’.
His two heroes are both ex-FO types and both terminally tonto about cricket.
Whether you're based in Cyprus or you know we do longer tours in Kenya or Oman or are busy just making it to the brigade at the moment up in Estonia, you know it's going to be a busy army and unfortunately we've got a busy adversary now in Putin. Gone full tonto, I think, as I'd say, and you know that's going to be quite... We've got 1,000 people on standby.
Oi, bruv. He's gone full tonto.
noun
a traditional Ugandan fermented beverage made from bananas