Green’s Dictionary of Slang

rear n.

1. the buttocks.

[UK]Gentleman’s Bottle-Companion 8: Have a care, says he, of the rear, says she, / To the right and left open, my dear, says he.
[UK]‘Peter Pindar’ ‘The Lousiad’ Works (1794) I 199: He found his front attack’d by fierce Miss Vernon; Who meant [...] To pour her foot in thunder on his rear.
[US]G.W. Harris ‘There’s Danger in Old Chairs!’ Weekly Nashville Union XIII Oct. in Inge (1967) 71: I say, did that feller get a swing at your rear?
[UK]Marvel 21 Dec. 16: Then kame a sound like tarin tripe on a frosti mornin an i felt a draft in mi rear.
[US]M. Bodenheim Georgie May 20: Servants were all alike [...] wanted to forget they were low-down, slaving nobodies by kissing the rears of the people they worked for.
[US]H. Roth Call It Sleep (1977) 146: The worst we can get is a kick in the rear.
[US]H. Miller Roofs of Paris (1983) 199: I didn’t have such a big rear when I was little.
[US](con. 1920s) S. Longstreet Pedlocks (1971) 147: Damn nice gals in Paris. My eyes been hangin’ out on stems all mornin’ just watchin’ ’em wriggle their little rears.
[US]W. King ‘The Game’ in King Black Short Story Anthol. (1972) 307: Sweet Mac gave her rear a light pat.
[US]B. Gutcheon New Girls (1982) 105: He reached over and squeezed Sally’s rear.
[US]G. Indiana Rent Boy 30: Chip has an endless list of johns who like it from the front and rear simultaneously.
[UK]Guardian Rev. 9 June 9: Don’t forget, the Buffer Belt does not protect your rear.

2. (orig. campus, also rears) a lavatory [the position in the rear of a college or ref. to sense 1].

[UK]Farmer & Henley Sl. and Its Analogues.
[UK]M. Marples Public School Sl. 112: Other synonyms [for lavatories] are rears, lats [...] and dubs.
[UK]B. Marshall George Brown’s Schooldays 170: And now let’s raid the rears and rout out any of the other new swine that are hiding there.

3. (Aus. drugs) a packet containing a measure of a narcotic drug.

[Aus]New Call (Perth, WA) 21 Apr. 12/7: ‘I want some “Angie”.’ ‘How much do you want?’ inquired the voice. ‘Oh! better give me eight “rears”,’ was the reply.

In phrases