One who acts gay in order to get close to a girl who they normally wouldn't be able to talk to then tries to turn the tables by saying that he's no longer gay to get with her. Slysexuals typically show a pattern of this tactic and unintentionally build a reputation for themselves making people believe they are in the closet. The opposite of a closeteer.
WTF?! I thought Peter was gay and now he apparently got with Ann, wow what a slysexual, somebody should call him out on that.