Like in the carcommercials for Carfax where it has the information on the car like how many owners wrecks and problems. Muff Fax is the info on a girls muff and how many "owners'' or problems like std's or anything undesirable.
An immensely powerful gust of wind which is excreted from the vaginal cavity which causes widespread chaos, famine and general ludicrous emotional distress to other humans and animals alike.