the horrible STD that results from the combination of a vampire and a werewolf. Most commonly found on polarbears.
Best way to prevent acquiring the Vierpool is to attend "special" seminars and to stock up on "bars."
"Aw man, last night was crazy."
"I caught the Vierpool"
"Aw man, I'm sorry. Here, take this bar. I got it at the seminar."
"Thanks man, you're the best!"
For other examples, see Lost Tapes on Animal Planet.