Slightly adulterated nickname of a particular elitist british hacker from manchester, some of whose antics were widely reported by the press in the 90s.

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.

When a man's cum burns the inside of his penis and often the vagina or anus of his partner

To be horny,
named after the description of a male's penis to be "on fire" when in need of a sexual fix.

when yur fucking a girl that can no longer get wet, and the friction builds up so quick that yur dick and her puss become aflame

When your cock fires our sperm/semen/cum