Okay, I'm not all good enough to combine 2 words together in English but the ボッシュート here is combined of 没収-confiscate(bosshuu) and ダストシュート-dust chute(dasutashuuta).

Demundo said:

Okay, I'm not all good enough to combine 2 words together in English but the ボッシュート here is combined of 没収-confiscate(bosshuu) and ダストシュート-dust chute(dasutashuuta).

I thought about it for a while, and after checking some examples, figured it was more used now just to represent the idea of dropping something out of site, as if down a trap door, rather than for any literal interpretation of the portmanteau. Took me far too long to find a semi-decent version of the associated music/FX on YouTube, too...