tri training, carbs and no weight loss

 Hmm, how to define it.  When you're doing endurance/cardio events (not sure if people experience this with weights or not) you can get to a point where your body just runs out of energy.  It's just like your car hitting empty.  All of the sudden you just can't go any farther.  Normally a 10-15 minute break will allow your body to recover enough to get you home or to a location that you can ge****er/gatorade.  Never a pleasant experience and most of us experience and then go "so that's what bonking is."
Maybe somebody can explain it better

Here is a link to a description of "Bonking"

tunedintocycling.wordpress.com/2008/05/10/cycling-nutrition- the-bonk/