Similar to the word bullshit but in a sulkier content. It's something that sucks horrible. Bullshit is used as foul diction for something that is a bunch of nonsense and therefore you can relate bullsuck as its "sister" word, but not as profound. This word takes a lot of pressure built up from that disappointing moment and allows you to not feel guilty about your language, enabling you to achieve a sense of relief making you feel better in the end, so it's a win-win situation.

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.