Onions, Garlics, Cheese, Oreoes, Nuts, Meat(make sure you clean your teeth with a toothpick afterward), Egg, Spices; peppers, tobacco.. and avoid food with sauces, anything juicy or has a strong smell. Also things that do not make you fart ;) say all sorts of beans.
Oh and never have an apple or pear after eating a meal that involves food in the grain category; rice, pasta..etc
Also NO ginger. It kills off germs and bacteria. Causing you to fart or burp.
After all this, of course go to the washroom and spray some perfume :D