Green’s Dictionary of Slang

selopas n.

apples.

1859, 1860		Hotten Dict. of Modern Sl. etc.
1864, 1867, 1870		Hotten Sl. Dict.
1890		Northampton Mercury 12 Apr. 12/4: ‘Neergs,’ greens [...] ‘selopas,’ apples, ‘edgenaro,’ oranges and ‘doogheno,’ good, will serve to show [...] the secret language of the London costermongers.