Green’s Dictionary of Slang

leracam n.

also lur-a-cham

[backsl.]

a mackerel.

1859		Hotten Dict. of Modern Sl. etc. 128: LUR-AC–HAM, mackarel.
1864, 1867, 1870		Hotten Sl. Dict. [as cit. 1859].
1873		Sl. Dict. 355: Ler-ac-am mackerel.