Usually refers to a cop on a bike, but has also been traditionally used to describe security guards or asshole cops as well. It has a negative connotation towards law enforcement agencies, and is often times used in extreme anger.
A humorous word used in the dialogue of Marvel's 'Avengers Assemble' Movie. A portmanteau word (2 words combined together to make one word e.g. 'Belieber'=Believer+Bieber) 'Capsicle' is the word formed from the combination of Captain and Icicle. Tony Stark, (Iron Man) says this to Captain america during an argument:
And dying in yo' bed many years from now, would ya be willing ta trade all da days from dis here day ta dat fo' one chance, just one chance, ta come back here as young men an' tell our enemies dat dey may take our lives but dey will never take our freedom ... YUB NUB!