Research into Gangster Language

As our main character 'Dirty Dez' is a long time British gangster we need to use British slang in the dialogue. I have looked at a website filled with British slang words which include-

Arse - This is a word that doesn't seem to exist in America. It basically means the same as ass, but is much ruder. It is used in phrases like "pain in the arse" (a nuisance) or I "can't be arsed" (I can't be bothered) or you might hear something was "a half arsed attempt" meaning that it was not done properly.
Barmy - If someone tells you that you're barmy they mean you have gone mad or crazy. For example you'd have to be barmy to visit England without trying black pudding!
Blimey - Another exclamation of surprise. My Dad used to say "Gawd Blimey" or "Gor Blimey" or even "Cor Blimey". It is all a corruption of the oath God Blind Me.
Bollocks - This is a great English word with many excellent uses. Technically speaking it means testicles but is typically used to describe something that is no good (that's bollocks) or that someone is talking rubbish (he's talking bollocks).
Bugger all - If something costs bugger all, it means that it costs nothing. Meaning it is cheap. If you have bugger all, it means you have nothing.
Chuffed - You would be chuffed to bits if you were really pleased about something.
Cobblers - I have heard people say "what a load of cobblers" more than once. Maybe that's because I talk so much rubbish. An equivalent would be what a load of bollocks. It means you are talking out of your butt and has nothing to do with any kind of dessert! Derived from the cockney rhyming slang where Cobblers Awls = Balls!
Crikey - Another exclamation of surprise. Some people say "Crikey Moses".
Dogs bollocks - You would say that something really fantastic was the dog's bollocks. Comes from the fact that a dog's bollocks are so fantastic that he can't stop licking them! Nice huh? Often shortened to just "The dog's".
Donkey's years - Someone said to me the other day that they hadn't seen me for donkey's years. It means they hadn't seen me for ages.
Give us a bell - This simply means call me. You often hear people use the word "us" to mean "me".
Grub - Food. Similar to nosh. I remember my Dad calling "grub's up", when dinner was ready as a kid. A grub is also an insect larva. Not usually eaten in England. Actually is available in some Australian restaurants!
On your bike - A very polite way of telling someone to f*** off.
Ta - We said "ta" as kids in Liverpool for years before we even knew it was short for thanks.
Tosser - This is another word for wanker and has exactly the same meaning and shares the same hand signal. Unfortunately my house in Texas was in Tossa Lane, which was a problem when telling older members of the family where to write to me!




These are just a few British slang words from http://www.effingpot.com/slang.shtml - although we are familiar with many of these we also learnt a few more.