When you want to find out where some new catchphrase like "my hed iz pastede on yay" comes from, Google meme observatory looks like the place to go. Don't know how I avoided running into that site before. I've certainly wondered about some of these phrases but by the time they attain enough popularity to make me notice and wonder, they're also widespread enough that a simple Google search doesn't necessarily return much of use. So it's good that someone else has gone to the effort of tracking them down.