In NZ in non-cycling circles, to bonk is something you do with another consenting adult in private somewhere!![]()
But yes, in sports events like cycling, to bonk is to "hit the wall"... to suddenly find yourself with depleting energy... and to truly bonk can mean that you tumnble off your bike - your body just gives up, some people have virtually passed out because their body has said "excuse me, you might want to go on, but there is physically no way that you can"