What to say if some one else says something really lame, or if you find yourself in a really lame situation. It is accompanied by a face where one eye is squinting and your mouth forms an 'O' shape on the opposite side of the face as the squinting eye. You may also use various pitches to say nerr, if you want to spice things up, or sing it.
Ben: I like to run about and hunt wild pigs
The World: Nerrrr!
You sit down on a bus and a fat redhead woman starts to talk to you. You could nerr her to her face or privately nerr about her amongst your friends.