Green’s Dictionary of Slang

treat n.

1. anything (or occas. anyone) admirable, enjoyable or pleasurable, also used ironically (e.g. cite 1910).

[UK]Marryat Snarleyyow II 172: Now prove your sum by kissing me / Yes, that is right, ’twas three times three;— / Arithmetic’s a treat.
[UK]Story of a Lancashire Thief 9: It was a treat to heat Joe patter — he was a clever cove!
[UK]Wild Boys of London I 172/2: ‘You never did seed Lucy, did you?’ ‘No,’ said Dick. ‘She’s a treat, and no mistake.’.
[UK]E.J. Milliken ‘Cad’s Calendar’ in Punch Almanack n.p.: Hair all flying, – tell you it’s a treat.
[UK]Sporting Times 1 Mar. 1/5: ‘Did you enjoy the party, Bobby?’ asked mamma. ‘It was a regular treat,’ said Bobby.
[UK]Sporting Times 31 Mar. 2/1: As you walk along the street / You can hear the punters bleat / ‘J’yer? Here’s anuvver treat! / No toke we’ve ’ad to eat / Since the bloomin’ ’orse got beat.’.
[UK]D. Stewart Dead Man’s Gold in Illus. Police News 10 Apr. 12/2: ‘Oh, just hark at him, Sammy. Isn’t he a treat?’.
[UK]H.G. Wells Hist. of Mr Polly (1946) 70: Lor, you are a Treat!
[Ire]Joyce Ulysses 305: The referee twice cautioned Pucking Percy for holding but the pet was tricky and his footwork was a treat to watch.
[UK]E. Garnett Family from One End Street 152: Bernard Shaw was indeed ‘a treat’ – ‘all dressed up like a dog’s dinner.’.
[US] in G. Legman Limerick (1953) 89: There was a young girl, very sweet, / Who thought sailors’ meat quite a treat. / When she sat on their lap / She unbuttoned their flap, / And always had plenty to eat.
[UK]A. Sillitoe ‘Loneliness of the Long-Distance Runner’ Loneliness of the Long-Distance Runner (1960) 10: I like doing all this. It’s a treat.
[US]M. Spillane Return of the Hood 11: [of women] I’ve seen real treats done up in trick suits in the beatnik shops.
[UK]K. Bonfiglioli Don’t Point That Thing at Me (1991) 42: You ought to see his moosh, where I hit him, it’s a treat.

2. (US campus) a good-looking woman.

[US]P. Munro Sl. U. 195: Bob, let’s go dancing and pick up on some treats.

In phrases

give (her) a treat (v.)

of a man, to have sexual intercourse.

[US]R. Chandler ‘Nevada Gas’ in Spanish Blood (1946) 134: Guess I’ll go home and give the little woman a treat.
give the boys a treat (v.)

of a girl or woman, to reveal inadvertently more of her body than would otherwise be seen, such as cleavage by leaning over or upper thighs or underwear when getting out of a vehicle or bending down to pick something up.

[[UK]Sheaves from an Old Escritoire 62: Thinking she might as well give her neighbour a treat, she jumped on the bed, drawing her legs up [...] her thighs being wide apart, must have allowed him to see the two coral lips of her cunny] .
[UK]Harrington & Powell [perf. Marie Lloyd] The Directoire Girl [lyrics] When I went out to eat to give the boys a treat / Of course, I put my new directoire skirt on / [...] / But I dared not sit down, in my directoire gown / I felt afraid my silk tights wouldn’t stand it.
W.S. Allen ‘War of the Gods’ at [Internet] She was the perfect beautiful eighteen-year-old receptionist and knew how to wear the right clothes so when she bent over her desk she could give the boys a treat with her huge breasts. Not too much, just enough to make them want to see more.