From the song All Star by Smash Mouth: /.../ She was looking kind of dumb with her finger and her thumb In the shape of an "L" on her forehead /.../ I've seen people doing this irl, but I haven't figuered out the exact meaning yet. And googling doesn't help much either... Does it mean "looser" or something in this direction? And does it have anything to do with Shrek? Thanks a lot!