verb-to snap, crack, or otherwise damage the bone in the upper leg, which connects the hip to the knee.
Origin: Late 1990's. Invented by 'swoopers', extreme athletes that get their daily adrenaline skydiving and skimming the ground.
"Hey man, you hear about AJ? Dude came down over the north field, got his boot caught on a rock and femured. He's done for like six months."