An expression taken from "buy now, pay later." This refers to the (often untrue) assumption that bisexual people are going through a phase and will eventually come out as gay. It is usually considered offensive.

A pubic hair piece. A toupee for the pubic area/genitals. In the 1700’s when mercury was used to treat sexually transmitted diseases (Gonorrhea or Syphilis) one of the side effects was the loss of pubic hair. To disguise this condition, that was not cured by mercury, a Merkin was employed.

A person who claims to be bi-sexual, but is really gay. This person will realize within a year or two that he or she is not attracted to the opposite sex at all.

When people come out as being Bi, before later revealing that they are actually Gay. Seen by some as easier than coming out.