Green’s Dictionary of Slang

confusion, fuss.

1953		Guardian 1 May 4/4: Why did Catullus die ar thirty? A weak chest, a highly strung nature and sexual excess [...] and what a tally-ho it would be for some writers!
1967		B. MacMahon Honey Spike n.p.: I wouldn’t be surprised with all this tallyho if I dropped a kid myself the minute we reached that bloody Spike [BS].
1996		Irish Times 26 Oct. n.p.: Surely David Hanly [...] would have heard people like Seán Ó Riada using the word, as in ‘What’s the tally-ho?’ [BS].