Sexual intercourse (English 20th century)
Provenance: how's your father? catchphrase associated with the British music-hall comedian Harry Tate (1872-1940). Apparently, he would exclaim it as a way of changing the subject and in order to get out of a difficult situation. The phrase either subsequently or simultaneously took on a life of its own meaning the same as a 'thingummy' or anything the speaker did not wish to name. From that, in phrases like 'indulging in a spot of how's-your-father', it became a euphemism for sexual activity.
From _Dictionary of Catchphrases_ (1995) by Nigel Rees
They were in the snug engaging in a spot of how's your father.
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