spiney biff, n. — Green’s Dictionary of Slang

spiney biff n.

[SE spina bifida, ‘a congenital malformation of widely varying severity in which there is a failure of one or more vertebræ to surround completely the meninges and spinal cord, usu. with effects on spinal cord function’ (OED)]

(UK juv.) a physically unco-ordinated person.

2001

OnLine Dict. of Playground Sl. 🌐 spiney biff n. derog. stupid or clumsy person.