Green’s Dictionary of Slang

open adj.

[abbr. get someone’s nose open under nose n.]
(US black)

1. excited by something.

[US]R. Woodley Dealer 61: [W]hat happens is that when you snort coke you get open, and you want more. You want to keep that high going.
[US]Ebonics Primer at 🌐 open Definition: really interested, excited. Example: Yo I was watching a karate flick the other day, shit had me open.
[US]Source Aug. 139: Fans who were once open off ‘Sugar Hill’ and AZ’s smoothed-out delivery, were left wondering: Why the fuck didn’t he blow up?
[US]W.J. Cobb To the Break of Dawn 13: ‘[W]e came here tonight to get y’all open’ [ibid.] 90: In the original proving grounds of the art form, the freestyle battle and the live on-the-street performance, the punchline was indispensable to getting a crowd open.

2. sexually excited, obsessed.

[US]C. Major Juba to Jive.

SE in slang uses

In compounds

open-arse (n.) [arse n.]

1. a medlar; occas. euph. as the anus; cit. 1732 refers to anal sex [the fruit’s large open disk between the persistent calyx-lobes].

[UK]T. Killigrew Parson’s Wedding (1664) II ii: Yet if you be cruel, he and they die, as useless as open-arses gathered green.
[UK]Mercurius Fumigosus 35 24–31 Jan. 276: A Shee-Costermonger, daughter to an Apple-Squire in Kent, which sells open Arses dead and alive.
[UK]B.E. Dict. Canting Crew n.p.: Open-arse a Medlar.
[UK]Ladies Delight 4: Others too curious will innoc / Culate their Plants on Medlars Stock, / (i.e. as Tongues in Vulgar pass, / They graft it on an Open-arse.
[UK]Grose Classical Dict. of the Vulgar Tongue n.p.: Medlar. A fruit, vulgarly called an open a-se; of which it is more truly than delicately said, that it is never ripe till it is as rotten as a t—d, and then it is not worth a f—t.
[UK]Lex. Balatronicum [as cit. 1785].
[UK]Egan Grose’s Classical Dict. of the Vulgar Tongue [as cit. 1785].

2. a prostitute [a coarse ref. to her stock-in-trade].

[UK]Shakespeare Romeo and Juliet II i: Now will he sit under a medlar-tree, And wish his mistress were that kind of fruit, As maids call medlars, when they laugh alone. Oh Romeo! that she were, O! that she were An open et caetera.
[UK]Mercurius Fumigosus 35 24–31 Jan. 276: A Shee-Costermonger, daughter to an Apple-Squire in Kent, which sells open Arses dead and alive.
[UK]B.E. Dict. Canting Crew n.p.: Open-arse [...] a Lewd Woman.
[UK]New Canting Dict. [as cit. c.1698].
open charms (n.) (also open C, wide C)

the vagina.

[UK]‘The C—’ in Flash Minstrel! in Spedding & Watt (eds) Bawdy Songbooks (2011) I 120: The C—! the C—! the open C’ / Where every man does like to be.
[UK] ‘The Sailor’s Yard’ in Ticklish Minstrel 32: ‘Alas! O lackaday!’ cried she, / ‘No more ’twill be popt in the open C.’ [Ibid.] 33: ‘O lor, what a yard!’ she cried, with a grin [...] And insisted that Jack should plough the wide C.
[US]Whip & Satirist of NY & Brooklyn (NY) 12 Feb. n.p.: Although to boarding used you are, / And ploughing, too, the open sea.
[Scot]Coal Hole Companion in Bold (1979) 91: The jolly tar so full of glee / Admires the tempting open C.
[UK] ‘The Columbine’ in Pearl 9 Mar. 25: No Roman dancer could surpass, / The way she shows her open C, / And flourishes her jutting arse.
[UK]Farmer & Henley Sl. and Its Analogues.
open high (n.) [high n. (1)]

(drugs) the intoxication one gets from breathing in ambient cannabis or crack cocaine smoke in a room, rather than actually smoking the drug directly.

[US]R. Shell Iced 169: I can’t even let the goodness collect in the air and get an open high!!!
open slather (n.) [SE open + UK dial./SAmE slather, to squander, to use in large quantities]

(Aus.) a situation with no restrictions or limits to one’s wishes.

[UK]E. Hill Territory 445: Open slather: A free hand.
[Aus]D. Niland Shiralee 209: You mean that would give her open slather?
[NZ]G. Slatter Gun in My Hand 180: Come round, she said, it’ll be open slather.
[Aus]J. O’Grady Aussie Eng. (1966) 65: If you’re goin’ out that way, call in at So-and-so’s pub. She’s open slather there on Sundays.
[NZ]McGill Dict. of Kiwi Sl. 79/2: open slather unconstrained and often riotous gathering available to allcomers; possibly from Irish ‘slighe’, access.
[NZ]McGill Reed Dict. of N.Z. Sl. [as cit. 1988].
[Aus]S. Maloney Sucked In 40: Once the police ID the body, it’ll be open slather.
[Aus]C. Hammer Scrublands [ebook] ‘[O]nce he was gone and the place was empty it was open slather’.