pony

1. (endearing) A horse of any size.endearing

2. (regional) A small serving of an alcoholic beverage, especially beer.Examples: "1879, “Some Queer Interviews: Interview with a Pony of Beer”, Puck, Vol. 5–6, p. 435"; "‘I’m on the inside track,’ said a pony of beer as it went galloping down a man’s throat."; "Demon popped into his mouth a last morsel of black bread with elastic samlet, gulped down a last pony of vodka and took his place at the table with Marina facing him across its oblong length."regional

3. (Australia, New South Wales, Victoria, Western Australia) A serving of 140 millilitres of beer (formerly 5 fl oz); a quarter pint.AustraliaNew-South-WalesWestern

4. (UK, slang) Twenty-five pounds (money).Examples: "“You said a pony,” interposed Clavering; “my dear fellow, you said a pony, and I’ll be eternally obliged to you; and I’ll not take it as a gift—only as a loan, and pay you back in six months. I take my oath, I will.” “Well—well—there’s the money, Sir Francis Clavering. […] Here’s five-and-twenty for you."UKslang

5. (US, slang) A translation used as a study aid; loosely, a crib, a cheat-sheet.Examples: "She kept the dates written down in her Latin 'pony', so she didn't have to bother about who it was."USslang

6. (slang) A ponytail hairstyle.Examples: "His hair is a semilong dull red and pulled back in a sloppy pony at the base of his neck, and his face is riddled with small freckles and grease, but out here I can see personal hygiene isn't exactly at the top of the priority list."slang