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2.
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
 
1.
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