Here's a good link that will probably help you a lot.
Here are some slang terms for potatoes:SpudsTatersMurphyTots
Hey (obviously), and the popular text slang such as lol, lmbo, omg
some words they used were hii. and byee.
Some slang terms for policemen are:5-0 (five-oh)LeoJacksLittle BearsPanduSkelSmokeyWhoop-WhoopWaspsTrollsThere are many more terms that are slang for police. See the Related Links below for a full list of slang words for policeman.
Slang words are informal words and expressions that are not considered standard in the speaker's dialect or language. Whats crackin whats poppin are just some terms.
Back slang is a type of reverse language thought to have been invented in Victorian England by market sellers. To speak back slang, you just say the words backwards. Some of the terms have actually become modern words, such as "yob" or "yobo" for "boy" or "boyo." Here's a good link to a site where there are a lot of good back slang terms listed.
slang
firebug
fine
The slang terms I'm familiar with are: P.I. Private Eye, Peeper and Dick
Here are some examples:CarJalopyFlivverRide
New slang and terms have been added and removed. Some words have also been changed, or altered by other parties.