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Someone who is an irritating twat or idiot, or someone who wanks horses
That ginger Dan is a right horse wanker
by Jon Howell June 03, 2006
British origin; created in conjunction with the original term 'wanker'. Used to describe someone who masturbates stallions, even within job description of one who collects semen from a stallion.

Other sayings commonly used in the same context are; "Poke in a pig", "screwing the pooch" and "Sticking the fleece"
"Thats John, our new horse wanker. terrible thing that happened to our last."
by RuneBleuRoan April 16, 2007