dead elves
Referrring to a group of people that is no fun by virtue of acting like puritans, boy scouts, or for their failure to participate. Since the word "lame" has itself been very lame for quite some time, this new term has stepped in to fill that need.
"So did John & Lisa make it out to the club last night?"
"No! Those f*cking dead elves!"
"No! Those f*cking dead elves!"