From Conservapedia

Homosexual bait and switch is a technique used by covert homosexuals in order to convert heterosexuals to homosexuality, or at least, question their heterosexuality. Covert homosexuals will heavily alter their personal appearance in order to disguise their gender. These covert homosexuals will enter "meaningful" relationships with heterosexuals of the same sex without ever disclosing their own true gender. These homosexuals do a convincing job by utilizing deceit and powerful mind-control techniques. Only when the victim thinks they are in love does the covert homosexual reveal their true identity. At this point, the victim is too emotionally attached to the homosexual to leave them, giving the homosexual the upper-hand. Coercion into a counterfeit same-sex marriage is not uncommon. Even victims that somehow escape a homosexual's grasp usually go through withdrawal which causes some to suffer a homosexual relapse.

The term homosexual bait and switch can also be used to describe other things; such as J.K. Rowling retroactively stating that a popular character, Dumbledore, from the Harry Potter series is homosexual.