subs. (common).More kicks than halfpence.
1785. GROSE, A Classical Dictionary of the Vulgar Tongue, s.v.
1811. GROSE and CLARKE, Lexicon Balatronicum, s.v. MONKEY.
1823. BADCOCK (Jon Bee), Dictionary of the Turf, etc., s.v.
1833. MARRYAT, Peter Simple, I. ii. When you get on board, youll find MONKEYS ALLOWANCE.
1856. C. KINGSLEY, Letter [3rd abridged ed., 1879], May. You fellows worked like bricks, spent money, and got midshipmans half-pay (nothing a-day and find yourself) and MONKEYS ALLOWANCE (more kicks than halfpence).