A negative person who tends to ruin other people's good times.

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.

descriptive noun

Describes a person who essentially ruins other people's fun, either because they openly disapprove of what other people are doing, or because their unpleasant attitude annoys or depresses everyone who would otherwise be enjoying themselves, if it weren't for that person acting like a 'wet blanket'.

The term is probably American in origin, first being used as slang in the mid 1800's. It was meant to compare a person to a wet blanket used to extinguish fires by smothering them, similar to how such a person would "extinguish" fun and excitement in social situations. Another, more modern interpretation of the term likens a dislikable or overbearing person to the aggravating, uncomfortable feeling of being covered by a blanket when it's wet.

Someone who is over-emotional. One who dwells on their negativity.

Someone who is generally in a negative frame of mind, sulks and ruins other peoples' fun.

A person who seems determined not to have a good time and refuses to play or interact with others. Someone who generally has a negative attitude. In some cases people can become wet blankets because they cannot win the games the others are playing or continously lose, and as a result give up, becoming a wet blanket. It is important to note the continous offenses as a wet blanket can result in becoming a soggy biscuit.

Someone or something that could have utility but chooses not to.

This is from the idea that a blanket could be a wanted item, but is no longer wanted when wet.