Fighting weight
From a road forum thread about knowing when you're at the right cycling weight (started by patentcad, of course). I thought it was worth sharing:
"the trick is to keep losing weight until your friends and family ask you if you've been sick. then you know you're within 10 pounds. if they start whispering to each other, wondering if you've got cancer or aids, you're within 5. when they actually do an intervention, you're at race weight." - Slowman (Dan Empfield)