look up any word, like thot:
 
1.
Person who, by their very presence near a fun or off the chain activity, will proceed to suck all fun or hope of good times from said activity; usually female
- " I'll call Steve to see if he wants to go out with us tonight."

- " Don't even bother man, his new girlfriend is a fucking fun vampire."

-" oh yea, you're right."
by A. Russell April 11, 2007
 
2.
Someone who sucks the fun out of a situation
"I can't go to your house today, my mom says I have to clean my room."

"Your mom is such a funvampire!"
by R=mc March 26, 2009