Green’s Dictionary of Slang

1. a piece of excrement.

1654		E. Gayton Pleasant Notes IV iv 191: Such odour breath’d, & such strong airs were hobling, / As use to ascend from a new laid Tantaublin.
c.1660		C. Cotton Valiant Knight 8: [He] gave his foreman a Tantadling.
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue n.p.: Tantadlin tart, a sirreverence, human excrement.
1811		Lex. Balatronicum [as cit. 1785].

2. used (derog.) of a person.

1659

Mercurius Democritus 3-10 Aug. 89: Of Hectors, Pads, Trapans, Priggs, Pmps, / and other new Tantwablins.