Green’s Dictionary of Slang

peace n.

1. in drug uses.

(a) STP; ‘a hallucinogenic chemical produced by the Dow Chemical Company. The initials are said to represent “serenity, tranquility, and peace,” or “scientifically treated petroleum”’ (Spears, Slang and Jargon of Drugs and Drink, 1986).

[US]Illinois Legislative Investigating Committee Drug Crisis in Spears (1986).
[US]S.N. Pradhan Drug Abuse.

(b) LSD.

[US] AS LVII:4 289: A sampling of current names for varieties of LSD would include peace, pearly gates, serenity [etc.].
[US]ONDCP Street Terms 16: Peace — PCP; LSD.

(c) phencyclidine.

[US]ONDCP Street Terms 16: Peace — PCP; LSD.

2. (US black) a place where one is happy and secure.

[US]Ebonics Primer at www.dolemite.com 🌐 peace Definition: place. ususally used in reference to good things contained within the place where you are. Example: Day’um kid look at all tha hoes up in dis peace.
[US]W.D. Myers Autobiog. of My Dead Brother 73: ‘I’m looking at you but I’m seeing me and feeling all warm, man. It’s about the peace’.

In compounds

peace pills (n.) (US drugs)

1. phencyclidine.

[US]Smith & Gay Heroin in Perspective 197: Angel Dust [...] in pill form called ‘Peace Pill’.
[US]D.E. Miller Bk of Jargon 338: peace pills: PCP.
[US]Microgram Bulletin XXXVI:8 183: The acronym PCP is believed to have been derived from the phrase ‘Peace Pills’ (PeaCe Pills).

2. a mixture of LSD and Methedrine.

[US]E.E. Landy Underground Dict. (1972).
[US] AS LVII:4 289: When LSD is mixed with other drugs [...] [s]uch mixtures are today called [...] peace pills.

SE in slang uses

In compounds

peacemaker (n.)

1. (also peacemake) the penis (cf. matrimonial peacemaker n.).

[Ire]Head Eng. Rogue Pt I ii 109: [His] Peacemake in amorous dalliances wrought not those effects in me as usually it doth.
T. Brown Salamanca Wedding 4: [...] in case he offends after that manner, full leave to make her self amends before, as she pleases; as also upon a second Trespass, to burn his Peacemaker.
[UK]Laugh and Be Fat 27: He had more Wit in his Anger, than to revenge himself of an ill Tongue, by burning his Peace-maker.
[UK]Farmer & Henley Sl. and Its Analogues.

2. (US) a pistol or revolver, esp. the Colt .45.

[US]J.R. Lowell Biglow Papers 2nd series (1880) 13: A feller [...] Lep up an’ drawed his peacemaker.
[US] ‘South-Western Sl.’ in Overland Monthly (CA) Aug. 126: Among the names of revolvers I remember the following: Meat in the Pot, Blue Lightning, Peacemaker, Mr. Speaker, Black-eyed Susan, Pill-box, My Unconverted Friend.
[US]Knoxville Wkly Chron. (TN) 16 Apr. 1/2: The Rural New Yorker notices the Taylor gun as a ‘peace-making gun’.
[US]Princeton Union (MN) 24 Feb. 5/5: He styles his improved guns ‘Peacemakers.‘ for [...] they will make war entirely out of the question.
[US]Salt Lake Herald (UT) 24 July 7/5: [...] for the purpose of conducting a test of the famous ‘peacemaker’ gun [...] manufactured by the Colt company.
[[US](ref. to 1844) Sun (NY) 7 Dec. 37/1: Commodore Stockton’s great gun [i.e. of an ironclad vessel], called the Peacemaker, burst and slew two emmbers of the Cabinet].
[US](con. 1870s) E. Cunningham Triggernometry (1957) 55: I’ll buy Old Peacemaker, here, from Rufe.
[US]R.F. Adams Cowboy Lingo 166: In 1870 the most famous of all ‘six-guns’ made its appearance; the Colt ‘Single-Action Army,’ variously named ‘Peacemaker,’ and ‘Hog leg’.
[US](con. 1877) J.G. Rosa Gunfighter 58: Hardin saw Armstrong’s 7½-inch-barrel Peacemaker, called out, ‘Texas, by God!’ and reached for his own gun.
[UK]N. Smith Gumshoe (1998) 118: I could feel my palms sweating against the stock of the gun. I didn’t relish holding two men with the peacemaker.
[US]R. Klein Jailhouse Jargon and Street Sl. [unpub. ms.].

3. (US und.) a club, a bludgeon.

[US]S.A. Crosby Razorblade Tears 224: [A]n old wooden baseball bat with nails driven into it [...] This peacemaker seemed like a good alternative [to a gun].

4. (W.I.) a male lover.

[WI]cited in Cassidy & LePage Dict. Jam. Eng. (1980).

5. (W.I., also peaceman) a police officer.

[WI]cited in Cassidy & LePage Dict. Jam. Eng. (1980).

In phrases

peace out (v.)

(US black) to be at peace, put at ease.

[US]W.D. Myers Slam! 76: You sitting in the back of a car with your homeboy and maybe some babes and things just peace out for you.