A word used to describe a person who enjoys equestrianactivities. Normally from a higher social class, someone who is hurumph, is also likely to spend their weekends down the stables, wearing tweed, visiting National Trust properties and events such as Henley Regatta and the Oxford / Cambridge boat race.
A: I'll introduce you to Quentin, he will be along in a minute, he is just giving Rupert a lift home from the stables.
B: Ah, is he hurumph, I'll get the best China out.