Green’s Dictionary of Slang

Taffy adj.

Welsh.

1976		A. Salkey Come Home, Malcolm Heartland 167: She was born in Swansea. Bajan father, Welsh mother. A proper Taffy spook!
1999		Indep. Rev. 2 Aug. 1: We now have a son who is known, with great affection, as The Taffy Yid.
2001		N. Griffiths Sheepshagger 232: You disobedient little bastard . . . little Taffy bastard, aren’t you?