Green’s Dictionary of Slang

roe n.

semen.

1635		H. Glapthorne Lady Mother II i: I look like a shotten herring now for’t. Jone’s as good as my lady in the darke wee me. I have no more Roe than a goose in me.
1870		Cythera’s Hymnal 45: That, while lecturing, he’d shot his roe, roe, roe.
1879		in G. Legman Limerick (1953) 51: There was a gay parson of Tooting / Whose roe he was frequently shooting.
1880		‘The Good Nobleman’ in Pearl 14 Aug. 26: And the little creatures found, / When they dragged him to the ground, / That, while lecturing, he’d shot his noble roe, roe, roe.
1970		B. Aldiss Hand-Reared Boy 145: I pumped my roe against her chubby thighs.
1971		(con. WWII) B. Aldiss Soldier Erect 160: I shot my row with considerable force.