When a dog or similar size / type of animal clamps onto a human's leg, and gives your leg a good fucking, usually without the human's consent.
Lewy walked into room with Jim, with Jim asking Lewy, "Where is your dog?" Within a second of hearing Lewy's voice, Woody the dog of the house clamped onto Lewy's leg. Lewy then being pushed to the floor as Woody fucked his leg good and hard.
de Lewis Chalk 30 Mai 2005