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2.
A dairy farmer or stockman. (New Zealand origin)

The man whom spends time with cows on their last night on the farm before being sent to a slaughterhouse. (American Origin)
"Forget going to this place called Walmart...I'll hit up the cow-spanker down the street for milk". (NZ)

Guy One: "Damn...that sucks for John."
Guy Two: "Why...because he has to stay late?"
Guy One: "No...he's the cow-spanker this week..."
Guy Two: "He is either going to love or hate that steak dinner tomorrow!" (American)
by Djgamer101 April 06, 2011
 
1.
though there is not an exact definition for the word it is usually used as a reference to something of a sexual nature. it generally means someone erotic.
"hey hows micheal doing did you get with him"
"oh ya i did he's such a fucking cow spanker"
by rosa1234 January 20, 2012