PIOG means Posted In Other Groups and PIAG means Posted In Another Group.
There is a list of commonly used acronyms on the CafeMom Newcomer's Group:
::The CafeMom Admin Team
Answer by CafeMom Admin at 8:44 AM on Dec. 12, 2008
Answer by Kimmers1116 at 9:58 AM on Dec. 12, 2008