From the Urban Dictionary:

santorum:

1. That frothy mixture of lube and fecal matter that is sometimes the by-product of anal sex.

2. Senator Rick Santorum (R-PA)

As his happy cries subsided, the sweet sticky santorum began dribbling from his distended asshole like melted mocha frappuccino. He told me that he loved me. It was only then that I realized the man I’d sodomized in a Pittsburgh bathouse was none other than Senator Rick Santorum (R-PA). I felt dirty.