Green’s Dictionary of Slang

a fit of eccentricity, craziness; thus oopesootic, lit. or fig. mad.

1909		Truth (Brisbane) 25 Apr. 11/3: Polyticks is oopesootic — / As no doubt, Sir, you will say.
1916		C.J. Dennis ‘Rabbits’ in Moods of Ginger Mick 91: ’E’s got the oopizootics reely bad, / An’ ‘idin’ in a burrer makes ’im mad.