Green’s Dictionary of Slang

teaich-yenneps n.

eight pence.

1859, 1860		Hotten Dict. of Modern Sl. etc.
1861		(con. 1840s–50s) H. Mayhew London Labour and London Poor I 23/1: Teaich-yenep ... Eightpence.
1935		R.T. Hopkins Life and Death at the Old Bailey 65: Costermongers invariably use the following terms in discussing money transactions [...] Teaich-yenep – Eightpence.