When you lay down in an aisle of a longs drug eating a whole box of kudos bars and cytosport...you bonked.
When you roll into a hotel to ask for an apple from the breakfast bar and the guy opens the back room and lets you take whatever you want based on your zombie, incoherent like condition.. you bonked
When you curl up under a soda machine eating a box of mike and ike and drinking a coke at a gas station... you've bonked.

Sometimes i think i can do the extra 30 miles without any calories, it never ends well, but i have gotten progressively closer!