It's a reference to The Great Cornholio, a recurring alter-ego of Beavis from the Mike Judge animated series, Beavis and Butthead.

Basically, when Beavis consumes too much sugar (or caffeine/stimulants), and someone says a spanish word, Beavis transforms into The Great Cornholio

The "TP" comes from the first appearance of @Cornholio, where they visit a school friend that's home sick with diarrhea... the friend's mom says she's going out to "buy more TP" (toilet paper)