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Phrase first appearing in the Lost recap for the second episode of the first season.
Jackhole pulls out a gun ex machina and pumps the mechasaur full of lead and everyone gathers around it and is shocked to realize that it's no invisible CIA mechasaur! It's an OMGWTFPOLARBEAR, because that makes SO MUCH MORE SENSE.
And then back in the present (Sayid) gets something coming through on the transceiver and it's some French woman from sixteen years ago and they eventually get Snicker Bitch to put her shit back together long enough to translate: "Somebody come help me, I'm all alone and it killed them all OMGWTFPOLARBEAR! *grrrsnarlyarglesmack*."
It's not the most brilliant sentiment, but I guess it struck a nerve with people, because I'm still seeing it online here in 2007. I pronounce it as "omigahwhatafuhPOLARBEAR!"