/keuh boohs"/ , n.
1. a car on a freight train, used chiefly as the crew's quarters and usually attached to the rear of the train.
2. Brit. a kitchen on the deck of a ship; galley.
3. Slang. the buttocks.
[ 1740-50; cabuse (D kabuis ) ship's galley, storeroom; cf. LG kabuus, kabüse, MLG kabuse booth, shed; further orig. uncert. ]