Green’s Dictionary of Slang

kakker-boosah n.

[caca n./kak n. + boosah, ety. unknown; note Hob.-Job. bhoosa ‘the husks and straw of various kinds of corn, beaten up into chaff [...] on the threshing floor’, thus poss. cognate with crap n.1 (2), orig. SE meaning of ‘chaff’]

prematurely voided excrement; vomiting.

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[UK]‘Jon Bee’ Dict. of the Turf, The Ring, The Chase, etc. 107: Kakker-boosah accidental excrementing, or adventitious accession of gastrodorsed compounds, digested and hastily excissed.