Green’s Dictionary of Slang

1. without any problems, easily.

1842		Bell’s Penny Dispatch 17 Apr. 4/2: [H]e smiled, and, unseen, gave us the wink [...] ‘I thought it would be queer if they could nip him so sweet as that,’ said Curtis.
1861		(con. 1840s–50s) H. Mayhew London Labour and London Poor I 64/2: They sell it at the public-houses to the ‘Lushingtons,’ and to them, with plenty of vinegar, it goes down sweet.
1892		J. Newman Scamping Tricks 88: He was a beautiful kidder and could patter sweet and pretty.
1901		Sydney Sportsman (Surry Hills, NSW) 30 Jan. 1/4: A bit of hot work was put in by the clerk of the scales [...] and as he and the committeemen who grafted in with him, did not do it sweet, they were, expelled from the club.
1905		‘Hugh McHugh’ You Can Search Me 61: ‘You betcher sweet!’ Dodo replied.
1910		Truth (Perth) 1 Oct. 4/7: You will plainly understand / That his fancy has been fanned / By a ‘clyner’ who will land / Him ‘dead sweet’ .
1932		‘William Hatfield’ Ginger Murdoch 29: Listen, Ginge, if you want a few bob, I’m holdin’ sweet.
1940		B. Appel People Talk (1972) 14: We played sweet over the Park Central, a little swing.
1961		B. Crump Hang On a Minute, Mate (1963) 92: That’ll put us in sweet with him.
2002		J. Cameron Hell on Hoe Street 21: So when Noreen reckoned she was sharing my gaff it all went sweet.
2018		G. Gilmore Class Act [ebook] He knew he had things sweet.

2. of a man, being kept by a woman (there is no implication of pimping).

1928		C. McKay Home to Harlem 82: ‘He was living sweet.’ There was something so romantic about the sweet life. To be the adored of a Negro lady of means, or of a pseudo grass-widow whose husband worked on the railroad, or of a hard-working laundress or cook. It was much more respectable and enviable to be sweet—to belong to the exotic aristocracy of sweetmen.
1977		J.L. Dillard Lexicon Black Eng. xiv: A term like, for example, living sweet may designate either living a Christian life (if the context is church) or having one’s bills paid by a woman (if the context is pimping or the activity of streetcorner men who would be pimps).