a sarcastic statement used as a test of sarcasm and/or affiliation. Used slyly, the person making the statement uses it to gain knowledge of a person's political, religious, sexual, or hobbyist interests by appearing to be on the side of the person they're talking to.
Alan: "Our Exxon Valdez rig doesn't need no stinking EPA regulations."
(ObLIvious) MIke: Yeah, money-grubbing EPA.
(Keen) Jerry: True, but that was sarcasm bait.
Alan: You're an asshole, Jerry, for saying that there should be no environmental regulation.