A warning/compliment issued to somebody that looks so good they risk injuring others just by being seen. It's unclear by what method this injury would occur, but presumably cardiac arrest or colloquial heartbreak. Also, may refer to the pain one feels in his/her gut upon seeing someone extremely attractive. May be described as a punch in the gut. Someone who is hurtin' em may elicit wistful sights of strangers as he/she walks by.

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 doing something so well or so fly you’re in danger of harming others.

a compliment paid to a sexy female as she walks pass you. this phrase is not spewed at each and every sexy female, but only the ones who are sexy, dressed to death from head to toe, and throwin dat booty xtra hard cuz she know you lookin. 9 times outta ten she smilin from ear to ear after you say it, but you'll never know cuz her back is towards you. she smilin though, trust me. she don't just look good,she hurtin em.

or
you see her, she look good but you on the go and don't really have time tospit at her. next best thing: don't hurt em baby