The act of you and your partner vomiting into each others mouths, while simultaneously having an orgasm, doing these things at the same time will greatly intensify your sexual pleasure.
Guy 1: Dude i totally pulled a Dic Harc Vagy on my girl last night!
Guy 2: Really? what did she do?
Guy 1: She moaned so loud her mom came running in to see if she was okay! Then we both choked on our vomit, out of surprise of her coming in and seeing us!