Green’s Dictionary of Slang

best; thus zeb taoc, best coat.

1859		Hotten Dict. of Modern Sl. etc. 131: ZEB, best.
1864, 1867, 1870		Hotten Sl. Dict. [as cit. 1859].
1873		Sl. Dict.
1909		(ref. to 1882) J. Ware Passing Eng. of the Victorian Era 271/2: Zeb (Shortened inverted word, 1882). Best. The zeb way we know is to throw the crockery at her. If you owe rent, toss the landlord double or quits, and if you know anything of tossing you’re bound to come off first zeb. [...] Zeb taoc [...] Best coat.