What are "extremely vulgar" lyrics?

I do not care about and will not mark songs that merely have a curse word or two, or even a song
full of cursing in most cases. Only a seldom few will be tagged with a label, and these are the ones
that are bad enough that if you were reading the lyrics at work and your boss saw you, you might
have to register as a sex offender.

Why am I marking these? Well as I mentioned above, some people are reading lyrics in places
where they might not want certain people reading over their shoulder, and this will warn you
that the lyrics in that particular song are really over the top. I don't give a shit about your parents,
it's just for your convenience. That's just how the label comes ;)

-singemfrc.com