Green’s Dictionary of Slang

(Irish) a coarse intensive.

1970		C. Brown Down All the Days 47: ‘I won’t eat me bollacking dinner,’ said Father, roaring again. [Ibid.] 162: ‘Great bollacking Jesus!’ somebody whispered with profound awe.
1973		H. Leonard Da (1981) Act II: Bolicky Biddy had only one diddy / To feed the baby on.