Police use this term to refer to a telephone or phone call while speaking on their two-way radios.
Radio Traffic:

-"L57, can you give me a public service?"
-"Negative. My cell battery is dead."
by ilikewerds March 25, 2011
The murder, or sometimes self-defensive, taking of a criminal's life. Often, but not always, committed by another criminal, such as in a shootout among rival gang members or a drug-deal that goes bad.
(1st person): Didja hear about the shooting last night behind the liquor store? Two guys got popped.

(2nd person): Yep. Those two were gang bangers that have been jacking up the neighborhood for months. But no more. I consider that a public service homicide.
by valkyriebiker February 18, 2009
Public service announcment or PSA is a short animated or live action film used to tell an important announcment.
Dude 1:yo did you the public service announcement about drunk driving??
Dude 2: dafuck is public service announcement
by Aemkayfellow May 25, 2022
Mental health care services for select needy groups of the population provided by the government
Repealing the IMD exclusion from Medicaid would be a public health service for mental health care
by Anonymous April 7, 2003