Definition from Wiktionary, the free dictionary
caboose (plural cabooses)
- (obsolete, nautical) A small galley or cookhouse on the deck of a small vessel.
- (US, rail transport) The last car on a freight train, having cooking and sleeping facilities for the crew; a guard’s van.
- (slang, baby-talk or euphemistic) buttocks
- (slang, sports) The person or team in last place.
- (last car on train): guards van (obsolete)
last car on a train