Green’s Dictionary of Slang

percy n.1

1. uses based on the supposedly effeminate male proper name.

(a) (orig. US, also percy-boy) an effeminate man, a weakling; one who appears exhausted.

[US]Ade Girl Proposition 3–4: Among the other Things she wore that Evening was a featherweight Escort who had Percy written all over him.
[Aus]Sun. Times (Perth) 21 Feb. 11/3: Lawn tennis with Percies I play / For ices brought round on a tray.
[UK]A. Binstead Mop Fair 74: A young gentleman who had Percy literally stamped upon him.
[US]S. Ford Torchy 34: I has him billed for a Percy boy that had strayed into the general office from the drygoods district.
[US]O.O. McIntyre New York Day by Day 30 July [synd. col.] Also Percy was there – each smart crowd has one. Buck teeth, wisps of down on the upper lip.
[Aus]E.G. Murphy ‘What Next?’ Dryblower’s Verses 66: With the latest craze in clothes The bustle waddled in. It showed itself upon the block, Where Percies promenade, And did its worst to try and shock The silvertail brigade.
[US]Trimble 5000 Adult Sex Words and Phrases.
[US]B. Rodgers Queens’ Vernacular.

(b) a masculine woman, poss. a lesbian.

[US]F. Swados House of Fury (1959) 51: ‘You’re a percy,’ Tony went on, hoarse with fury.

2. the penis [initial letter of proper name].

[Aus]B. Humphries Barry McKenzie [comic strip] in Complete Barry McKenzie (1988) 78: I come in here for a snooze and she tried to move in on old percy.
[UK] Percy [film title].
[UK]Roger’s Profanisaurus in Viz 87 Dec. n.p.: Percy 1. UK n. Penis. As in: ‘Im just off to point Percy at the porcelain’. 2. A small green 0-4-0 saddle tank steam locomotive.

In compounds

percy-purse (n.) [SE purse; purse n. (2) is prob. coincidental]

the vagina.

[Aus]B. Humphries Traveller’s Tool 131: My problem is I put sheilahs on a pedestal, but let’s face it, tell me a better way to take an optic of a percy-purse.

In phrases

point percy at the porcelain (v.) (also poke percy at the porcelain) [SE porcelain, i.e. the lavatory bowl]

to urinate; thus point percy at the pavement, to urinate on the street.

[Aus]B. Humphries Barry McKenzie [comic strip] in Complete Barry McKenzie (1988) 18: Can’t a bloke be caught short [...] without a pack of bastards like you pinching him for pointing percy at the pavement.
[UK]Galton & Simpson ‘Cuckoo in the Nest’ Steptoe and Son [TV script] I’ll just pop outside first and point Percy at the porcelain.
[Aus]R. Beckett Dinkum Aussie Dict. 41: Pointing Percy at the porcelain: To take a leak, have a piss. To urinate.
[Aus]Penguin Bk of More Aus. Jokes 355: The barman suggested that he might need to go to the toilet. ‘Nah, I’ll be apples. Pour me a few more.’ And he continued to drink, showing not the slightest desire to point Percy at the porcelain.
[NZ]McGill Reed Dict. of N.Z. Sl. 160: point/poke percy at the porcelain To urinate. ANZ mid C20.
[UK]D. Szalay London and the South East 57: Just going to point Percy at the porcelain. back in a sec.