A male or female booty call who is particularly hideous aesthetically that one uses for sex, but will only visit them or allow them to come through, long after the sun has gone down. Later niters are usually the very last resort, after all other potential sexual options have been exhausted. One will never ever under any circumstances been seen in public with their late niter. Late niters must be out of the house/apartment in the morning before ones roommates awaken and are frightened to the point of nearly calling the police.

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.