FMH: (Action verb and an adjective)Fuck me hard or fuck me HARD, depending on the extremity of hardness you'd like to be fucked. Can be used as a good thing (ex. way to express a major turn on) or a worst case scenario (ex. finding out your fiance is not your baby's daddy)
"FMH" *Looking at picture of hot James Franco in his undies with uhhhhh his package bulking out* "FUCK ME HARD" XD
Teacher: "Okay class, your take home final is due today, it's worth 75% of your grade"
Student (who obviously didn't complete the assignment): FUCK ME HARD!