Used to describe a person without street smarts; i.e. lacking the common sense required to deal with the potential dangers of real life outside of school.
Your everyday normal person, who is not medically retarded, but acts in a way that makes you think, "man, that dumbfuck is retarded!" Used as to not offend medically retarded people.
Man, that fuckeralmosthit my car pulling out of the parking lot, what the streetard!
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.