I think that means ‘ritual mounting’ by a dominant male dog, performed on a submissive male dog (or other species).
Lol, the big 100 lb. canine monster lowers his head in a submissive manner to everyone so they’ll pet him, but not to this guy. Both dogs looked at him straight on with “I’m the big alpha dog and you’re lower than flea dirt” stares. Hubby politely commented on it and had the big one go around to everyone to show he had the goods on the guy and it still went over his head. Zoooom, everything went over his head. The moron had the nerve to say we are lucky to have such a president who cares so much for everyone and it’s making us look good to other countries... that anyone was better than “that Palin”... and hey, he’s black and we’ve had enough conservative old white men. That’s when I nearly lost it. In the end, the dogs and I concluded he wasn’t worth it. I raised smart dogs but I may have failed miserably with Juniorette if this is what she’s going to be bringing home. However, hubby pointed out she’s the alpha there so there’s still hope.