British slang meaning to hide and keep quiet, possibly deriving from the phrase let sleeping dogs lie in the sense of not making a noise or causing a disturbance. It probably originating in the 19th Century, and was used by poachers who would hide and keep quiet in order to snare rabbits or to avoid being found by gamekeepers and their dogs.
The act of taking your woman doggie style in a vigorous and lively manner, ultimately bringing her to climax while you enjoy an unrestrained view of her perfectly full ass and blow your load only after she has been fully satisfied. This position allows for maximum penetration and pleasure.