O.p. definitions

o.p.

Original Poster
Found on http://www.noslang.com/dictionary/o/

---

O.P.

O.P. is British slang for an observation post.
Found on http://www.probertencyclopaedia.com/browse/ZO.HTM

---

o.p.

Out of print.
Found on http://www.trussel.com/books/glossary.htm

---