Videodecavalocomendoumamulherdequatro -

But the user might have intended a different meaning. Let me consider that "cavalo" (horse) is involved with a woman, perhaps in a story where they have a relationship. Maybe the horse is eating the woman, but that's a violent interpretation. Alternatively, "de quatro" could be "on all fours" as in a four-legged position, which might be a position they're in together.