three stops short of Dagenham

UK /ˌθɹiː stɒps ˈʃɔːt əv ˈdæɡən(ə)m/US /ˌθɹi stɑps ˈʃɔɹt əv ˈdæɡənəm/

adjective1

•
(UK, slang) Crazy; mad.
- He winked at me. ‘Now, my friend, I’m three stops short of Dagenham.’ / ‘Three stops short of Dagenham?’ I asked. / Bert roared with laughter. ‘Barking, mate,’ he said. ‘I’m fucking barking.’ — 2011