Winning at Poker. Specifically, placing in the money in poker tournaments where the competitors are collectively called "donkeys".
Girl: So what do you do?
Dude: Oh, I'm usually flogging the donkey every night...I'm netting about 120k.
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Masturbating violently enough to cause bruising and leisons around the scrotum/ genital area.
Jake:Hey were you flogging the donkey in there?
Mark: Ohh you bet your sorry ass I was
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