Green’s Dictionary of Slang

a beggar and scrounger, a tramp.

1846		Bell’s Life in Sydney 18 July 3/2: Many [taverns] gave away spirits, wines, and malts on the occasion, and some shoolers and spungers indulged freely on the cheap score.
1863		Dublin U. Mag. Jan. 86/1: Faith, your majesty,I didn’t make them crowns at all; it was a big shuler of a fellow that took employment with me yesterday .
1910		P.W. Joyce Eng. As We Speak It In Ireland (1979) 321: Shooler; a wanderer, a stroller, a vagrant, a tramp, a rover: often means a mendicant.
1938		Seumas MacManus Rocky Road to Dublin n.p.: His mother had particular interest in all shuilers. There was never a wanderer or beggar, tinker or pedlar, crossed her threshhold without finding themselves seated .