Green’s Dictionary of Slang

1. (US) pleasant; expert; first-rate.

1880		F. Remington letter in Splete (1988) 27: If any son-of-a-gun says they are not the ‘daisy thing’ he never breathed the fumes.
1883		Cincinnati Enquirer 20 May 11/6: In the third inning McCormick made a daisy three-bagger.
1885		C.F. Lummis letter 1 Mar. in Byrkit Letters from the Southwest (1989) 297: The daisiest funeral that ever was.
1889		Dead Bird (Sydney) 28 Sept. 3/4: ‘You say ’at Jerry O’Toole is the daisy bowler for de Skylights’.
1891		Bird o’ Freedom (Sydney) 7 Mar. 4/2: ‘Why, Parkes, that youngster there [...] / As got a daisy crop o’ ’air’.
1895		J.S. Wood Yale Yarns 160: You’re a daisy athlete, and no mistake!
1901		‘Hugh McHugh’ John Henry 77: His language is all fine and daisy.
1914		W. Sickert New Age 19 Mar. 631: It is not what I once heard my old friend the sub-editor of the ‘New York Herald’ describe as ‘A daisy story,’ but it is what the sporting touts call ‘a stone ginger’.
1920		S. Lewis Main Street (1921) 122: Maybe we aren’t as highbrow as the Cities, but we do have the daisiest times.
1953		W. Brown Run, Chico, Run (1959) 18: We’re going to a daisy joint and Loco’s getting some tea. You beat it.

2. (Aus.) used for non-specific emphasis.

1913

Truth (Sydney) 27 Apr. 11/3: This werry fast young feemale / [...] / Went clean off her daisy rocker / On him, right bang off the reel.