PAC II Project Management System
Pacific Masters Swimming
Pack My Suitcase
Package Management System (computer software)
Pacoima Middle School
Paint Mixing System(s)
Palms Middle School
Pamper Me Softly, Inc.
Pantone Matching System (color matching for publishing)
Pardon My Stupidity
Parked Motorcycle Syndrome (winter blues)
Parras Middle School
Particle Measurement System
Pass My Shotgun
Passe Musikalske Studiner
Passport Management System
Patient Monitoring System
Pavement Management System
Payson Middle School
Pedestal Mounted Stinger
Penfield Middle School
Pennbrook Middle School
Penndale Middle School
Pennichuck Middle School
People's Medical Society
Pepperoni Mushroom & Sausage
Percent of Market Share
Performance Management System
Performance Measurement System
Performance Monitoring System
Permanent Measurement System
Permitted Maximum Signal (ITU-T)
Personal Mailing System
Personnel Management Specialist
Phantom Menace Syndrome (Star Wars)
Phase Measurement System
Phased-Mission System
Philips Medical Systems
Phoenix Missile System
Physical Media Section
Picturephone Meeting Service (AT&T)
Piedmont Middle School (California)
Pike and Musket Society (English civil wars living history group; Australia)
Pines Montessori School (Kingwood, TX, USA)
Pipeline Management System
Plainfield Middle School
Planned Maintenance Schedule/Systems
Planned Maintenance System/Subsystem
Pollicita Middle School (Daly City, CA)
Pony Motor Starting
Poor Motivational Syndrome (band)
Portable Monitoring Set
Portable Monitoring System
Post Meal Sleepies :-)
Post-Marketing Surveillance (monitors ongoing safety of marketed drugs)
Post-Millennium Stress
Potential Murder Suspect (law enforcement)
Power Management System
Power Modulation Symposium
Power Money Sex
Practically My Sister

Practice Management System
Pre Main Sequence (astronomy)
Precious Metals Sector
Precise Mousing Surface (3M mousepad)
Pre-Marital Sex
Pre-Millennium Stress
Presidential Management Staff (Philippines)
Pressure Modulation System
Pretty Mean Sisters (WWF wrestling)
Preventive Maintenance System
Principal Marine Surveyor
Probability of Mission Success
Problem Management System
Processor Memory Switch
Procurement/Personnel Management System
Production and Marketing Systems
Production Management Specialist
Productive Members of Society (recovery oriented)
Professional Military Studies
Professor of Military Science
Profiler Meteorological System
Program Management Specialist
Program Management Squadron
Program Management Support
Program Management System
Program Manager Surface
Program Master Schedule
Program/Project Manager, Sea (NAVSEA)
Programme MaghrÈbo-SahÈlien
Project Management Specialist
Project Management System
Project Manager Ships
Project Master Schedule
Project/Program Manager, Ship (Naval Sea Systems Command)
Property Management System
Prospect Management System
Proud Marin Sisters
Provisioning Monitoring System
Public Message Service
Public Message System
Pueblo Middle School
Pulse, Motor, Sensation

Some highlights from the list:
Pardon My Stupidity
Picturephone Meeting Service (AT&T)
Post-Millennium Stress

What in the world was AT&T thinking when they named it that?

My personal favorite:

Pass My Shotgun

Did you purposely exclude the most common: Pre Menstrual Syndrome?

-D

Perhaps we should write to acronymfinder.com and ask why Pre Menstrual Syndrome is omitted from their database.

*LOL*

all this because of a strange email address.