[DannyTN]

"why not take the care to use language precisely?"

Because it's boring. Language should be fun and alive! Wordplay is a fine intellectually stimulating art.

Words that once were considered slang are now accepted even by some of the most staunch grammatarians and new slang words are invented. Slang words usually are more precise and communicate more information that proper King's English can. For example "My Bad" versus "I'm sorry, I made a mistake".

Much more precise! Amazing, huh?

[Red Boots]

Fun and alive, or used to communicate? You decide which, then we'll debate. Wordplay IS fun, though the fun of it comes precisely from it's lack of communication. You can play with language, or communicate with it, but not often both at the same time.

[Oztrich Boy]

Do you usually use:

"My bad": use of slang expressions is a sign of slovenly thinking, and is frowned upon by intelligent people.

"I'm sorry, I made a mistake": use of long phrases to express an idea that could be conveyed more succinctly is a sign of lack of thought before speaking.

"mea culpa": Use of a dead language (or French) to voice an idea that could be better communicated in anglo-saxon words (eg "my Bad") is a sign of pretension and should be avoided.

Hope this helps