Green’s Dictionary of Slang

(Irish) a whore; thus fig., an unpleasant woman.

1650		Captain Thomas Stukeley in Bliss Irish Writings from the Age of Swift (1979) 79: [I] am af[r]aid Brian Mac Phelemy is wyd his streepo, and forgets to hang a siegne or let us in .
c.1670		‘Purgatorium Hibernicum’ in Carpenter Verse in English from Tudor & Stuart Eng. (2003) 412: Amongst this traine, who (thinke you) espied he / But his old mistress, Madam Dydy? – / That pin’d to death, the fawning strapp! / Some say for love, some of the clapp .
1832		S. Lover Legends and Stories 189: ‘You lie,’ says he, ‘you impident sthrap.’.
1842		S. Lover Handy Andy 248: ‘Bad luck to you, you owld sthrap!’ he muttered between his teeth.
1910		P.W. Joyce Eng. As We Speak It In Ireland (1979) 336: Strap; a bold forward girl or woman.
1928		L. Mackay My Oul’ Town 127: It was that strap Kitty, so I nivir let on I heard her.
1936		M. Harrison All the Trees were Green 264: D’you remember [...] that ould strap that said she was my wife?
1948		R. Park Harp in South 17: ‘Don’t be filthy, yer dirty strap!’.
1952		B. MacMahon Children of the Rainbow 261: ‘You daft strap!’ I shouted.
1965		(con. 1940s) B. Behan Confessions 24: There was a hatchet-faced oul’ strap in the carriage with me.
1985		T. Murphy Thief of a Christmas in Plays: 2 (1993) Act II: I [...] sent him back, lame, to his strap of a widdy.
1989		H. Leonard Out After Dark 62: Gloria was the kind of strap who could look after herself in a pit of snakes.
1991		B. Quinn Smokey Hollow n.p.: It [...] had a long tail that whipped at their faces while their Granda cursed it, ‘Will you hup outa that, yu lazy streepach.’ [BS].