Your friend incorrectly used the punchline from an old joke. The vampire uses a tampon rather than a maxi-pad, as tampons have little strings on them, just like teabags.
The joke as I have heard it goes:
A Vampire walks into a bar. He sits down and asks the bartender for a cup of blood. The bartender shrugs his shoulders and gets the Vampire a cup of blood.
A few minutes later, another Vampire walks in and sits down. He also asks for a cup blood. The bartender gets him a cup of blood.
A few more minutes pass and yet a third Vampire walks in and sits down. He asks the bartender for a cup of hot water. The bartender, looking puzzled, says to the Vampire, "Wait a minute! Two other Vampires were just here and they ordered blood to drink. Why do you want hot water?"
The Vampire pulls out a used tampon and says: "It's ok, I'm just having Tea."