Used vulgarly to indicate an agressive mode of sexual intercourse.

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 mixture between the words thrust and fuck, meant in a sexual context. The word is used as a code when at school so teachers won’t know what your saying.