Santorum is the frothy mix of anal lube and fecal matter that is sometimes the byproduct of anal sex. Santorum didn't exist until 1966, when, after a failed series of controverted experiments ( that involved dead animals and a lot of mayonnaise ), Senator Rick Santorum was able to synthetize the product.
Get a guy or a gal in adequate posture. Apply generously lube all around the rim area. Fuck wildly until santorum comes out on its purest form. Now you can collect Santorum and deliver it to your friends.