One who will defend his or her share of blankets by any means necessary.
Oftentimes blanketeers will even go so far as to deprive the second party in the bed of adequate amounts of blanket for sufficient coverage.
"Dammit Allison, I’m freezing, you are such a blanketeer."
"Christ man, I woke up totally sans covers this morning, Ruddy is such a blanketeer."
Combination of "David Blunkett" and "Big Brother" (from Orwell's 1984, not the trashy TV show!), to illustrate the fact that Blunkett wants us all tagged, DNA profiled, ID'd and watched by surveillance cameras at all times, because of the bogeymen of "illegal immigration", "terrorism", and "benefit fraud".
"Big Blunkett's not satisfiedthat the UK already has 10% of the world's surveillance cameras, so he's set a 5 year plan and another target to top this"