High Noon: ‘Spay Yo Mama’? Hunh?

En route to a son’s school today, Cindy spotted a billboard that encouraged viewers to ‘Spay Yo Mama.’ That prompted Sam to ask: “What’s that suppose to mean?” Replied Cindy: “Nothing you need to worry about. Yo Daddy’s fixed.” Then, for her readers, Cindy offered: “Never miss a teachable moment.” The Facebook post has received 14 friend comments so far, including one from a FF in the PR industry: ” It’s one of the worst examples of ‘planned messaging’ I’ve ever seen. Horrifyingly inappropriate and badly executed.”

Question: Anyone know what this means? Can you think of other examples of advertising messages that are, ahem, so clever that they cause readers to scratch their heads?