Bonking is the same as hitting the wall. It's when your glycogen stores are depleted and your muscles don't have the energy required to function as you want them to. You may get dizzy, feel light headed, and even have blurry vision. In that condition you would need to eat or drink something.
While lifting I have experienced similar but less intense symptoms, like feeling really tired and a bit nauseated, but I can recover with a little rest and water.
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