PSA means Public Service Announcement.
The Full Answer
PSA is a slang abbreviation that stands for Public Service Announcement, which…
is used at the start of a message to indicate that it contains information or advice that is in the public interest.
PSAs convey information to raise awareness of an issue…
and often promote changes in attitude or behavior.
Where Would You See PSA?
In texting… and on social media, such as Twitter… and Facebook… and Instagram… and websites, such as Reddit… and messaging apps, such as Snapchat.
PSA: The liquor store closes in two hours. Move your ass!
PSA: Don’t tag your friends in photos at the carnival today, unless you’re sure they didn’t call in sick to work.
PSA: I am very sensitive and have a long memory, so anything you say to me will never be forgotten.
Random PSA Stuff
The earliest public service announcements were made before and during the Second World War in the UK and US.
Other PSA Meanings
Prostate Specific Antigen (a protein produced by the prostate gland).
Pro Snowboarders Association.
Photographic Society of America.
Public Service Agreement.
IATA code for Pisa International Airport in Italy.
Groupe PSA is a French multinational manufacturer of automobiles and motorcycles sold under the Peugeot, Citroën and DS Automobiles brands.