Green’s Dictionary of Slang

1. cocaine.

1933		D. Maurer ‘Junker Lingo’ in AS VIII:227: Cocaine is known as C., snow, coke, happy dust, heaven dust.
1949		Monteleone Criminal Sl. (rev. edn).
1959		J.E. Schmidt Narcotics Lingo and Lore.
1969		R.R. Lingeman Drugs from A to Z (1970).
2001		ONDCP Street Terms 11: Heaven [...] Heaven dust — Cocaine.
2008		Post-Star (Glen Falls, NY) 3 Aug. 18/5: There are many slang terms for cocaine [...] big C, blanco, blast, [...] girl, heaven, Mama Coca, [...] pimp, she [...] toot, trains, stardust.

2. heroin; morphine.

1949		Monteleone Criminal Sl. (rev. edn).
1953		Anslinger & Tompkins Traffic In Narcotics 310: heaven dust. Morphine [...] or heroin.
1959		J.E. Schmidt Narcotics Lingo and Lore.
2001		ONDCP Street Terms 11: Heaven [...] Heaven dust — [...] heroin.

(US gambling) the point of eleven in craps dice.

1965		J. Thompson Texas by the Tail (1994) 6: Joe, of course, is the lowest point on the dice. Above it are [...] , Eighter-Decatur (three [i.e. combinations]), Quinine (a bitter two), Big Dick (two) and the fielders, Heaven-eleven and Boxcars, which have no bearing after the initial roll.
2002		J. Burkardt ‘Lucky Duck’ Wordplay 🌐 heaven eleven (the winning initial roll of eleven in craps).

to be hanged; thus feel like going to heaven in a string, to be so deliriously happy as not to mind even the possibility of imminent death.

1591		Greene Second Part of Conny-Catching in Grosart (1881–3) X 82: The quest went vpon him and condemned him: and so the Priggar went to heauen in a string.
a.1641		‘The Great Boobee’ in Ebsworth Roxburghe Ballads (1891) VII:2 274: It [i.e. Westminster Abbey] was a fine sight to see; / Methought I was going to Heav’n in a String. / Like a great Boobee.
1657		J. Poole The English Parnassus 336: Hang’d. Chok't with a hempen squincy. To dangle from the cursed tree. To go to heaven in a string. To take a turne at Tyburne.
1662		G. Torriano [trans.] The second alphabet consisting of proverbial phrases 180: Sbatir sulla fune, i.e. esser impiccato, to gasp by a rope, viz. to be hang’d, to look thorough a Hempen window, or go to Heaven in a string.
1679		England's remembrancer for the late discovery of the horrid plot 1: Accept the Mercies of our Gracious king, / Lest you do go to Heaven in a String.
1682		J. Gadbury A true narrative of the horrid hellish popish-plot 1: With Lyes in their mouths go to Heaven in a string; / So prosper all Traytors, and god save the king.
1692		R. L’Estrange Fables of Æsop 451: [He] [r]esolv’d [...] to go to Heaven in a String. Upon this, he immediately provides himself a Halter; fits the Noose, and pitches upon the Place of Execution.
a.1708		T. Ward England’s Reformation II (1710) 47: Then may he boldly take his Swing, / And go to Heaven in a String .
1734		C. Johnson Hist. of Highwaymen &c. 98: I was condemn’d to be hoisted up by the Neck, and go to Heaven in a String.

(US) strongly, very much.

1612		Chapman Widow’s Tears IV iv: fan.: Would to heaven I had seen her! Canst tell whither she went? gia.: Full-butt into Lorenzo’s house.
1896		H. Blossom Checkers 116: I wish to heaven I had ‘gone out;’ instead of getting well.
1899		K. Chopin ‘The Awakening’ Ch. XXIII 🌐 ‘I hope it isn’t Arobin,’ he muttered to himself as he walked. ‘I hope to heaven it isn’t Alcee Arobin.’.
1952		J.H. Griffin the Devil rides outside 316: ‘[H]ave you ever tried to pat [a Frenchwoman] on the behind the next day? Chances are she slapped you to heaven’.
1949		Wodehouse Mating Season 26: The animal niffed to heaven.
2000		J. Martin ‘Mr. Smutty’ in FFWD Weekly V:49 30 Nov. 🌐 All of which is just the ‘scenic route’ to the following sentiment: by the time you read this, I hope to heaven that Canada has said ‘yes’ to its v. own fleet of mystic flyboys/girls.