Green’s Dictionary of Slang

small beer.

1631		R. Brathwait Whimzies xii. 97: How this threede-bare Philosopher shruggs, shifts, and shuffles for a cuppe of six [N].
1633		Rowley A Match at Midnight I i: O monster Father, looke if hee bee not drunke, the very sight of him makes me long for a cup of sixe.
1655		R. Younge Against Drunkards 3: Nor hath the richest Sherrie, or old Canarie any more operation with them, than a cup of six hath with me [OED].
1788, 1796		Grose Classical Dict. of the Vulgar Tongue (2nd, 3rd edn) n.p.: Sixes, small beer, formerly sold at six shillings the barrel.
1810		in Ancient British Drama II 461: I suppose he means small beer, which, among the vulgar, still goes by the cant name of sixes [OED].

old ale priced at sixpence per quart.

1889–90		Barrère & Leland Dict. Sl. II. 98: Old six (common), old ale at sixpence a quart. Spoken–Look what I’ve got to do tonight! There’s fourteen ‘pubs’ on my beat... That means that I’ve got fourteen pints of old six to get down me.
1896		E. Pugh Man of Straw 332: Two ’alves o’ld six, missie, please.
1905		Sporting Times 3 June 1/5: Ultimately they had a wager of two pints of old six and two threepenny ‘Pullaways’.
1910		‘Doss Chiderdoss’ ‘A Picture-Book Christmas’ Sporting Times 24 Dec. 1/3: The menu’s a cold faggot and half of ‘old six’.

whisky and small beer.

1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1997		Share Slanguage.

1. (US) a 64-ounce (9-litre) bottle of malt liquor.

2003

Urban Dict. 14 Oct. 🌐 Tyler is often found drinking a six four of beer before going to the bar.

2. a 1964 Chevrolet Impala.

1999

Dr Dre ‘Some L.A. Shit’ 🎵 One-time’s, sunshines, and fine-ass bitches / Hawaiian thai, drive-by, six-fo’s on switches.

3. see two by four n.²

see sixty-nine n.

the Six Counties that comprise Northern Ireland.

1974		P. Fiacc Wearing of the Black 39: Of the wee six I sing Where to be saved you only must save face and whatever you say , you say nothing.
1983		M.J. Murphy Ulster Folk 33: [T] he land on the left [...] is in ‘the State’ (as we always said when alluding to the Twentysix Counties); on the right the land is in the North — ‘The Wee Six’.
2008		R. Bates Shakespeare and the Cultural Colonization of Ireland 115: [T]he inhabitants of the ‘wee six’ Ulster counties have learned to speak without really speaking.
2009		L. McIlvanney All the Colours 104: It was years since I’d been in Ulster, Northern Ireland, the Black North, the Wee Six.

see under six! excl.

respectable.

1909

J. Ware Passing Eng. of the Victorian Era 225/1: Six of everything (Workwomen’s). Said by workwomen and workmen’s wives in praise of a girl who marries with a trousseau meeting the respectable requirements of this phrase.

see two by four n.²

a warning shout to alert drug-users or illicit street vendors to the presence of the police or security guards; the drugs or merchandise should be hidden or even thrown away to prevent problems in a search.

1993–2003		Bob Williams on Urban Dict. 🌐 six up When someone says ‘six up’, it means the police are nearby, so whatever you are doing that is illegal you’d better hide it. This phrase is most commonly heard in parking lots at Phish concerts where many people openly sell or use drugs, or illegally vend food or beer. ‘Six up!’ is used to give people a heads up when the cops are coming around or when there is an undercover cop trying to bust people.
2003		Eble Campus Sl. Nov. 8: 6-up – police officer: Here comes the 6-up! Watch out!