Not necessarily an Americanism, and pleasant enough, but my late mother-in-law used to refer to the utility area next to the kitchen as the caboosh - or perhaop kaboosh - never saw it spelt. This was where a boiler or two was and clothes were dried or aired.

Also heard it from my parents as being the guards-van on, probably, a Canadian train.

And the expression 'the whole caboosh' meaning the complete works, whole shooting-match, whole issue, usually in the context of some degree of catastrophe.

Still extant?