caboose
noun
1
the buttocks US, 1919.
2
the final participant in serial sex. From the phrase PULL A TRAIN used to describe the practice US, 1970.
3
the youngest child in a family US, 1969.
4
a jail US, 1865.
5
a small house or shack TRINIDAD AND TOBAGO, 1956.
6
a cooking shed CAYMAN ISLANDS, 1985