Green’s Dictionary of Slang

(US Und.) skilfully.

1842		‘Sarah’s A Blowen’ in Nobby Songster 18: Young Sarah’s a blowen: / Vot does the thing neat; / She’s kept by a Gent, / Who hundreds has spent, / On Sarah the blowen.
1888		R. Barnett Police Sergeant C 21 71: What about the other petticoat; the one who has done us all so neat by her beautiful scarper.
1904		Number 1500 Life In Sing Sing 263: I’ve been tailed all over the wilds by a mob of western bulls. They had me in Pa, but I ducked them neat.
1935		(con. 1920s) J.T. Farrell Judgement Day in Studs Lonigan (1936) 595: ‘They pulled it off so neat,’ Studs marvelled.