Green’s Dictionary of Slang

madball adj.

(US) crazy.

1967		N. Mailer Why Are We in Vietnam? 143: Grizzer’s mad-ball charge is like a stroke across the strings of nerve in his life.
1977		Dallas Times Herald 9 Jan. 4H: Marty Feldman and Michael York play identical twins...in ‘The Last Remake of Beau Geste,’ with madball Feldman making his directing debut [HDAS].