When I think of bonking, I think of it as a catastrophic glycogen depletion. There's nothing left in the tank. Its time to go home and refuel.
What I think happened to you was not a total depletion of reserve energy but something more akin to maxing out in the weight room or doing a boulder problem that's got a move you can only stick once or twice a day. Tons of fuel left but the muscles are fried.
I suppose you could call the second scenario going anaerobic or hitting your lactic theshhold
I guess it doesn't matter though, they both mean the ride is over and getting home will suck.