how's your father

euphemism Sexual intercourse or activity. Usually preceded by "a bit of" or "a spot of." Jeremy snuck under the bleachers with his girlfriend to have a spot of how's your father, but ended up getting caught by the headmaster. It's well-known that having kids is going to drastically reduce the how's your father in your relationship, but it's something many couples still struggle with. How could you leave Aiden alone with his girlfriend? He's a teenage boy with raging hormones—of course he's looking for a bit of how's your father!

how's your father

sexual intercourse. British informal

A pre-World War I music-hall catchphrase, how's your father was earlier used to mean ‘nonsense’ before acquiring its present sexual sense. It is now used also to refer to a man's penis.