Green’s Dictionary of Slang

top-yob n.

[backsl.]

a pot-boy.

[UK]Hotten Dict. of Modern Sl. etc.
[UK]Sl. Dict.
[UK]Farmer & Henley Sl. and Its Analogues.
[UK]Mirror of Life 29 Dec. 15/2: [I]n the old taverns of the period proprietored by these pugs [he] acted the part of ‘top yob’ or ‘chucker out’.