Green’s Dictionary of Slang

(W.I.) foolish, ridiculous.

1942		L. Bennett ‘So De Heat’ in Jam. Dialect Poems 8: Side a dem is poppyshow.
1980		(con. 1950s) M. Thelwell Harder They Come 86: ‘Pappy-Show!’ old Sister Anderson exclaimed loudly [...] to demonstrate that she was not impressed by the finery.
2000		R. Antoni Grandmother’s Erotic Folktales 199: I gave them the biggest pappyshow wedding Corpus Christi has ever seen.