Michael Rosen, radio4 presenter speaks out about language change, he discusses how common words have been shortened over the years and have mostly been influenced from the sixteenth century. He is very certain we shorten words a daily basis for example giving are friends and acquaintances nicknames or shortening their names, is it because we are too lazy to pronounce a whole name or are we now comfortable with are friend or acquaintance that is comes natural to shorten their name. Rosen is very certain that we are just far too tired to pronounce words and find them too difficult, yawn.He clearly being sarcastic.
If we are going to shorten common words like "doc" means doctor these play on words should be used if we understand the total meaning.