PO
noun a
probation
officer or
parole
officer
US, 1966
po
noun
1
a chamber pot. From the pronunciation of 'pot' in French pot de chambre. Survives, mainly, through the efforts of the antique trade UK, 1880.
2
in pool, position. A horrid contraction, but one that is in actual use US, 1993.
3
a promiscuous girl, one who will 'put out' US, 1963