Typical moaning from the old farts
The English language has, lets face it, always changed, and it always will and for this reason there is no such thing as speaking properly, old words die, new ones are created all the time! (http://www.askoxford.com/asktheexperts/faq/aboutwordorigins/quiz for example) Do you think 100 years ago the way you speak you have been considered 'proper', of course not!
Language changes for a number or reasons: regional dialects merging / immigration / exposure to other cultures, getting around limitations of the language, adapting to new mediums (IM / Text speak) and of course identity / community (ghetto or 'leet speak (back in the '90s)), or just because people hear a new word and they like it!
Although it may be true that with the spread of globalisation that this is speeding up / more noticeable.
But it seems to most of the people on this site anyone under the age of 30 who speaks differently is a lazy, self-absorbed, low achieving criminal, then complain about a lack of respect! (Do you post a lot on HYS on the beeb? If not you should take a look, I think you'd like it)
Kinda (slang alert!) reminds me of Family Guy:
"Hey, why do you cops always have to harsh our buzz?"
"He used a teenage colloquialism; Break out the tear gas."
But as noted by other posts the idea of a single guide to lazy-drunk-violent-yoof-speak is fundementally flawed as, guess what, different groups of lazy-drunk-violent-yoofs speak differently!
Although I do love the idea of the daughters making up words - Trying to remember the Blackadder episode where he met the guy who compiled the first dictionary!