Let me break it down. "Travesti" in Spanish typically refers to a transgender woman or a sex worker, depending on the context. "Abotonada" means buttoned, like a shirt. "Por el culo" is "by the ass" or "from the butt." "Por un perro" is "by a dog." So put together, it's a video where a transgender woman is being buttoned from the ass by a dog. That still doesn't make a lot of sense. Maybe "abotanada" is meant, which is a slang term for defecating? But even then, combining that with a dog is odd.