The National Security Agency (NSA) defines OPSEC as:
OPSEC – Operations Security – The process of denying potential adversaries any information about capabilities and/or intentions by identifying, controlling, and protecting generally unclassified evidence of the planning and execution of sensitive activities. – Source
People on internet forums love acronyms, and this one takes the cake. What better way to show your fellow forum members your superiority and lack of “proof” to back up a claim, than to call an audible when someone posts “Pics or it isn’t true!“. Your response? “OPSEC”.