The Associated Press Stylebook, which has traditionally set standards for language usage within the media landscape, mystified Twitter users Tuesday when it tweeted a reality-bending, wrist-slapping admonishment. “Don’t use the term mistress for a woman who is in a long-term sexual relationship with, and is financially supported by, a man who is married to someone else. Instead, use an alternative like companion, friend or lover on first reference and provide additional details later,” the tweet read. SNIP It also spurred a joke-fest with people tweeting alternatives to mistress, like “side piece” or “homewrecker.”