It seems like a word made up on the spur of the moment by someone randomly smacking their keyboard against their face a couple of times, but in fact a bahohonebukd is a type of tuning fork utilised by the Aborigines in the making of didgeridoos. I first encountered one of these devices whilst I was away at band camp, sometime after I'd broken my flute, but a little before I'd broken myself on a didgeridoo.

Source: http://dictionary.reference.com/browse/bahohonebukd