tupping

/T AH1 P IH0 NG/
verb
  1. 1

    To mate; used of a ram mating with a ewe.

  2. 2

    To have sex with, to bonk, etc.

  3. 3

    (regional English) To butt: said of a ram.

Source: https://en.wiktionary.org/wiki/tup, https://en.wiktionary.org/wiki/tupping