If you've ever heard George Carlin's famous "Seven Dirty Words" you can't say on TV, you can safely avoid using all seven in your subject lines. They will definitely get you blocked.
Here is a list of 100 more that you should avoid using as well.
Top 100 words/phrases NOT to use in your subject lines:
all words that relate to sex or pornography
Jordan Ayan is the CEO of SubscriberMail (www.subscribermail.com), an email marketing services and technology provider.