Green’s Dictionary of Slang

the menstrual period.

1888–94		‘Walter’ My Secret Life (1966) I 100: I have been very ill as you know, was in the family way, my monthlies stopped.
1899		Crissie 72: ‘You don’t know the difference between a blotch of monthlies and a daub of hymen juice!’.
1912		in Randolph & Legman Ozark Folksongs and Folklore (1992) I 122: You’re a liar, says the third whore, / For mine’s the biggest one [of all], / And when I have my monthlies / It’s like Niagara Falls.
1922		Joyce Ulysses 351: Near her monthlies, I expect, makes them feel ticklish. I have such a bad headache today.
1929		in E. Wilson Twenties (1975) 330: Fucking her when she had the monthlies.
1934		H. Miller Tropic of Cancer (1963) 231: First she wouldn’t come across because she had the monthlies.
1945		‘Cats on the Rooftops’ in Mess Songs & Rhymes of the RAAF 2: Your wife has got the monthlies, and your daughter says she’s coy.
1952		J. Jones From Here to Eternity (1998) 32: For when his Chinese shackjob’s got the monthly, ’ey?
1960		C. MacInnes Mr Love and Justice 30: I’m sorry – I’m wrought up. I always am a bit just after my monthlies.
1975		T. Berger Sneaky People (1980) 144: Her monthly was several weeks overdue.
1978		W.D. Myers It Ain’t All for Nothin 126: ‘How’d you find out? [...] about the baby.’ ‘Oh, I miss my month’.
1996		W.D. Myers Slam! 72: ‘Maybe she got her month or something, I don’t really know’.
1996		H. Roth From Bondage 135: He finger-fucked her when she had the monthlies.