What is "tupping"

Usage examples of "tupping".

Sean Courtney, faced with the sight of somebody actually tupping his ewe lamb, was fully capable of destroying both them and himself.

But he was one of your wrath-of-God tyrants who won't be gainsaid, and quoted Queen's Regulations, and bullied me about Duty and Honour - and I was young then, and fagged out with tupping Ranavalona, and easily cowed.