An American idiom:
1. to make selfish use of, impose upon, take advantage of. Marge Simpson is so thoughtful of others that she lets people walk all over her. (Marge Simpson's nature allows others take advantage of her.)
2. to easily win a game against an opponent. The Chupacabras walked all over the Chinchillas in the fourth game of the playoffs. (The Chupacabras won against the Chinchillas by a wide margin.)
"These boots are made for walkin'..."