School slang. [f. TOSH sb.1] a. trans. To splash, souse. b. intr. To bath, tub.
1883. J. P. Groves, From Cadet to Captain, iii. 27. Toshing was the name given to a punishment inflicted by the cadets on any one of their number who made himself obnoxious. The victim, dressed in full uniform, was forced to run the gauntlet of his brother cadets, who, as he passed, emptied the contents of their tosh-cans (small baths holding about three gallons of water) over the wretched lads head.
1903. Farmer & Henley, Slang, s.v., He toshed his house beak by mistake, and got three hundred.
1905. H. A. Vachell, The Hill, i. I believe he toshes nowonce a month or so.