Green’s Dictionary of Slang

1. (UK Und.) acting as a lookout.

1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.

2. eyeing up women.

1818		W. Perry London Guide.
1843		Satirist & Sporting Chron. (Sydney) 25 Mar. 3/1: Miles’ Boy at times climbs the Fig Tree, it’s rather a nice place for ‘touting’.