I try not to write lyrics using the slang and vernacular as it tends to become "dated" rather quickly.
I agree, depending on the genre of music. Obviously some rely heavily on the use of ultra-current or even inventive wording as part of the appeal.
However, I'm with you. I try to place it more to the "timeless" side of lyrics when possible.
Also, slang terms can be rather localized in some cases so again, a good reason not the use them writing.
Great point. Especially with the internet, and now anyone having a global reach!
I mean it more from the perspective of a danger of writing thinking you are saying one thing and it could mean something VERY different.