The cool way to refer to the police. When you're cocked off your ass in the car driving 40 mph over the speed limit with a 20g bag past curfew with a broken taillight, and someone says "hey look guise its the popo" suddenly the situation no longer seems dangerous and the posibility of getting pulled over becomes non-eixistent.
Jarrett: FUCK DUDE I JUST SAW A COP!
Bob: hahahah the po po.. hahahhaha
Dan: hahhahhhah hey dude let's race that mustang!!